| Place Name | County | Total ZIP Codes | Population (2022) |
|---|
| Abingdon | Knox County | 1 | 3,066 |
| Abington Township | Mercer County | 4 | 397 |
| Adair | Mcdonough County | 1 | 212 |
| Adams | Adams County | 1 | 44 |
| Adams Township | LaSalle County | 3 | 1,877 |
| Addieville | Washington County | 1 | 271 |
|
| Addison | DuPage County | 1 | 36,977 |
| Addison Township | DuPage County | 8 | 88,654 |
| Adeline | Ogle County | 2 | 108 |
| Aetna Township | Logan County | 5 | 283 |
| Afton Township | DeKalb County | 2 | 762 |
|
| Akron Township | Peoria County | 2 | 1,040 |
| Alba Township | Henry County | 4 | 202 |
| Albany | Whiteside County | 1 | 876 |
| Albany Township | Whiteside County | 4 | 890 |
| Albers | Clinton County | 1 | 1,257 |
| Albion | Edwards County | 1 | 2,127 |
| Alden | Mchenry County | 1 | 167 |
| Alden Township | Mchenry County | 2 | 1,501 |
| Aledo | Mercer County | 1 | 3,812 |
| Alexander | Morgan County | 1 | 159 |
|
| Alexis | Mercer County | 1 | 951 |
| Algonquin | Mchenry County | 1 | 29,924 |
| Algonquin Township | Mchenry County | 6 | 87,921 |
| Alhambra | Madison County | 1 | 663 |
| Alhambra Township | Madison County | 2 | 1,498 |
| Allen Township | LaSalle County | 2 | 453 |
| Allendale | Wabash County | 1 | 464 |
| Allens Grove Township | Mason County | 2 | 507 |
| Allenville | Moultrie County | 1 | 130 |
| Allerton | Vermilion County | 1 | 237 |
|
| Allin Township | Mclean County | 2 | 877 |
| Allison Township | Lawrence County | 2 | 265 |
| Alma | Marion County | 1 | 292 |
| Alma Township | Marion County | 4 | 793 |
| Alpha | Henry County | 1 | 556 |
| Alsey | Scott County | 1 | 344 |
| Alsip | Cook County | 1 | 19,264 |
| Altamont | Effingham County | 1 | 2,137 |
| Alto Pass | Union County | 1 | 448 |
| Alto Township | Lee County | 3 | 695 |
| Alton | Madison County | 1 | 27,868 |
| Alton Township | Madison County | 5 | 25,902 |
| Altona | Knox County | 1 | 463 |
| Alvin | Vermilion County | 1 | 262 |
| Amboy | Lee County | 1 | 2,527 |
| Amboy Township | Lee County | 2 | 2,841 |
| Amity Township | Livingston County | 4 | 853 |
| Anchor | Mclean County | 1 | 108 |
| Anchor Township | Mclean County | 2 | 359 |
| Andalusia | Rock Island County | 1 | 1,401 |
|
| Andalusia Township | Rock Island County | 3 | 2,372 |
| Anderson Township | Clark County | 3 | 378 |
| Andover | Henry County | 1 | 653 |
| Andover Township | Henry County | 3 | 633 |
| Andres | Will County | 1 | 36 |
| Anna | Union County | 1 | 4,470 |
| Annapolis | Crawford County | 1 | 76 |
| Annawan | Henry County | 1 | 928 |
| Annawan Township | Henry County | 4 | 927 |
| Antioch | Lake County | 1 | 14,185 |
| Antioch Township | Lake County | 5 | 27,664 |
| Appanoose Township | Hancock County | 2 | 336 |
| Apple Canyon Lake | Jo Daviess County | 1 | 447 |
| Apple River | Jo Daviess County | 1 | 400 |
| Apple River Township | Jo Daviess County | 2 | 458 |
| Arbury Hills | Will County | 1 | 1,637 |
| Arcola | Douglas County | 1 | 2,974 |
| Arcola Township | Douglas County | 2 | 3,226 |
| Arenzville | Cass County | 1 | 354 |
| Arenzville Township | Cass County | 3 | 784 |
| Argenta | Macon County | 1 | 952 |
| Argyle | Boone County | 1 | 353 |
| Arispie Township | Bureau County | 3 | 939 |
| Arlington | Bureau County | 1 | 175 |
| Arlington Heights | Cook County | 2 | 75,221 |
| Armington | Tazewell County | 1 | 366 |
| Aroma Park | Kankakee County | 1 | 584 |
| Aroma Township | Kankakee County | 4 | 4,910 |
| Arrington Township | Wayne County | 2 | 275 |
| Arrowsmith | Mclean County | 1 | 391 |
| Arrowsmith Township | Mclean County | 3 | 544 |
| Artesia Township | Iroquois County | 4 | 691 |
| Arthur | Douglas County | 1 | 2,407 |
| Asbury Township | Gallatin County | 2 | 56 |
| Ash Grove Township (Iroquois County) | Iroquois County | 3 | 754 |
| Ash Grove Township (Shelby County) | Shelby County | 3 | 448 |
| Ashkum | Iroquois County | 1 | 659 |
| Ashkum Township | Iroquois County | 3 | 1,347 |
| Ashland | Cass County | 1 | 1,479 |
| Ashland Township | Cass County | 1 | 1,233 |
| Ashley | Washington County | 1 | 542 |
| Ashley Township | Washington County | 2 | 901 |
| Ashmore | Coles County | 1 | 783 |
| Ashmore Township | Coles County | 4 | 1,214 |
| Ashton | Lee County | 1 | 1,007 |
| Ashton Township | Lee County | 2 | 900 |
| Assumption | Christian County | 1 | 1,280 |
| Assumption Township | Christian County | 2 | 1,420 |
| Astoria | Fulton County | 1 | 1,274 |
| Astoria Township | Fulton County | 3 | 1,320 |
| Athens | Menard County | 1 | 2,076 |
| Athensville Township | Greene County | 3 | 146 |
| Atkinson | Henry County | 1 | 1,157 |
| Atkinson Township | Henry County | 2 | 1,371 |
| Atlanta | Logan County | 1 | 1,234 |
| Atlanta Township | Logan County | 2 | 2,226 |
| Atlas Township | Pike County | 5 | 351 |
| Atwood | Douglas County | 1 | 1,143 |
| Auburn | Sangamon County | 1 | 4,952 |
| Auburn Township (Clark County) | Clark County | 2 | 281 |
| Auburn Township (Sangamon County) | Sangamon County | 4 | 5,998 |
| Audubon Township | Montgomery County | 6 | 309 |
| Augusta | Hancock County | 1 | 763 |
| Augusta Township | Hancock County | 3 | 812 |
| Aurora | Kane County | 5 | 196,569 |
| Aurora Township | Kane County | 9 | 129,772 |
| Austin Township | Macon County | 4 | 184 |
| Aux Sable Township | Grundy County | 4 | 15,139 |
| Ava | Jackson County | 1 | 689 |
| Avena Township | Fayette County | 1 | 2,184 |
| Aviston | Clinton County | 1 | 1,953 |
| Avoca Township | Livingston County | 2 | 277 |
| Avon | Fulton County | 1 | 688 |
| Avon Township | Lake County | 4 | 63,998 |
| Ayers Township | Champaign County | 3 | 407 |
| Baileyville | Ogle County | 1 | 126 |
| Bainbridge Township | Schuyler County | 2 | 538 |
| Bald Bluff Township | Henderson County | 4 | 37 |
| Bald Hill Township | Jefferson County | 3 | 776 |
| Baldwin | Randolph County | 1 | 457 |
| Ball Township | Sangamon County | 6 | 7,442 |
| Banner | Fulton County | 1 | 164 |
| Banner Township (Effingham County) | Effingham County | 2 | 377 |
| Banner Township (Fulton County) | Fulton County | 1 | 378 |
| Bannockburn | Lake County | 2 | 1,456 |
| Bardolph | Mcdonough County | 1 | 226 |
| Barnett Township | De Witt County | 3 | 286 |
| Barnhill Township | Wayne County | 2 | 611 |
| Barr Township | Macoupin County | 3 | 464 |
| Barren Township | Franklin County | 5 | 345 |
| Barrington | Cook County | 1 | 10,739 |
| Barrington Hills | Cook County | 5 | 3,938 |
| Barrington Township | Cook County | 4 | 16,418 |
| Barry | Pike County | 1 | 1,397 |
| Barry Township | Pike County | 2 | 1,710 |
| Barstow | Rock Island County | 1 | 73 |
| Bartelso | Clinton County | 1 | 656 |
| Bartlett | DuPage County | 1 | 41,017 |
| Bartonville | Peoria County | 4 | 6,448 |
| Basco | Hancock County | 1 | 131 |
| Batavia | Kane County | 1 | 25,693 |
| Batavia Township | Kane County | 5 | 35,521 |
| Batchtown | Calhoun County | 1 | 237 |
| Bath | Mason County | 1 | 346 |
| Bath Township | Mason County | 5 | 567 |
| Bay View Gardens | Woodford County | 1 | 411 |
| Baylis | Pike County | 1 | 125 |
| Beach Park | Lake County | 4 | 13,482 |
| Bear Creek Township (Christian County) | Christian County | 3 | 457 |
| Bear Creek Township (Hancock County) | Hancock County | 3 | 258 |
| Bear Grove Township | Fayette County | 2 | 572 |
| Beardstown | Cass County | 1 | 6,193 |
| Beardstown Township | Cass County | 1 | 6,740 |
| Beason | Logan County | 1 | 137 |
| Beaucoup Township | Washington County | 4 | 420 |
| Beaver Creek Township | Hamilton County | 3 | 274 |
| Beaver Township | Iroquois County | 1 | 588 |
| Beaverville | Iroquois County | 1 | 366 |
| Beaverville Township | Iroquois County | 4 | 516 |
| Beckemeyer | Clinton County | 1 | 909 |
| Bedford Park | Cook County | 6 | 624 |
| Bedford Township | Wayne County | 2 | 1,100 |
| Beecher | Will County | 1 | 4,658 |
| Beecher City | Effingham County | 1 | 359 |
| Belgium | Vermilion County | 2 | 474 |
| Belknap | Johnson County | 1 | 105 |
| Bell Plain Township | Marshall County | 4 | 249 |
| Belle Prairie City | Hamilton County | 1 | 112 |
| Belle Prairie Township | Livingston County | 2 | 146 |
| Belle Rive | Jefferson County | 1 | 413 |
| Belleville | Saint Clair County | 4 | 44,118 |
| Bellevue | Peoria County | 3 | 2,109 |
| Bellflower | Mclean County | 1 | 327 |
| Bellflower Township | Mclean County | 3 | 491 |
| Bellmont | Wabash County | 1 | 231 |
| Bellwood | Cook County | 1 | 19,105 |
| Belmont Township | Iroquois County | 2 | 2,402 |
| Belvidere | Boone County | 1 | 25,544 |
| Belvidere Township | Boone County | 8 | 29,516 |
| Bement | Piatt County | 1 | 1,906 |
| Bement Township | Piatt County | 3 | 1,669 |
| Benld | Macoupin County | 1 | 1,723 |
| Bennington Township | Marshall County | 4 | 1,290 |
| Bensenville | DuPage County | 1 | 18,480 |
| Benson | Woodford County | 1 | 446 |
| Bentley | Hancock County | 1 | 39 |
| Benton | Franklin County | 1 | 7,284 |
| Benton Township (Franklin County) | Franklin County | 4 | 8,814 |
| Benton Township (Lake County) | Lake County | 4 | 19,103 |
| Berkeley | Cook County | 1 | 5,189 |
| Berlin | Sangamon County | 1 | 186 |
| Berlin Township | Bureau County | 4 | 811 |
| Bernadotte Township | Fulton County | 4 | 308 |
| Berreman Township | Jo Daviess County | 3 | 107 |
| Berry Township | Wayne County | 2 | 264 |
| Berwick Township | Warren County | 5 | 300 |
| Berwyn | Cook County | 1 | 56,376 |
| Berwyn Township | Cook County | 1 | 56,960 |
| Bethalto | Madison County | 1 | 9,506 |
| Bethany | Moultrie County | 1 | 1,379 |
| Bethel Township | Mcdonough County | 4 | 153 |
| Beverly | Adams County | 2 | 110 |
| Beverly Township | Adams County | 3 | 281 |
| Bible Grove Township | Clay County | 2 | 102 |
| Big Foot Prairie | Mchenry County | 1 | 0 |
| Big Grove Township | Kendall County | 1 | 1,831 |
| Big Mound Township | Wayne County | 3 | 1,643 |
| Big Rock | Kane County | 1 | 1,038 |
| Big Rock Township | Kane County | 4 | 1,885 |
| Big Spring Township | Shelby County | 2 | 520 |
| Biggsville | Henderson County | 1 | 347 |
| Biggsville Township | Henderson County | 1 | 591 |
| Bingham | Fayette County | 1 | 114 |
| Bird Township | Macoupin County | 2 | 353 |
| Birmingham Township | Schuyler County | 2 | 103 |
| Bishop Hill | Henry County | 1 | 128 |
| Bishop Township | Effingham County | 3 | 1,840 |
| Bismarck | Vermilion County | 1 | 538 |
| Blackberry Township | Kane County | 6 | 17,171 |
| Blackhawk Township | Rock Island County | 5 | 9,571 |
| Blair Township | Clay County | 3 | 707 |
| Blairsville | Williamson County | 2 | 322 |
| Blandinsville | Mcdonough County | 1 | 668 |
| Blandinsville Township | Mcdonough County | 1 | 806 |
| Blissville Township | Jefferson County | 4 | 635 |
| Bloom Township | Cook County | 9 | 86,530 |
| Bloomfield | Adams County | 1 | 99 |
| Bloomingdale | DuPage County | 1 | 22,028 |
| Bloomingdale Township | DuPage County | 11 | 112,310 |
| Bloomington | Mclean County | 3 | 76,527 |
| Bloomington City Township | Mclean County | 4 | 78,372 |
| Bloomington Township | Mclean County | 4 | 2,638 |
| Blount Township | Vermilion County | 6 | 3,287 |
| Blue Island | Cook County | 1 | 23,457 |
| Blue Mound | Macon County | 1 | 1,339 |
| Blue Mound Township (Macon County) | Macon County | 5 | 939 |
| Blue Mound Township (Mclean County) | Mclean County | 5 | 435 |
| Blue Ridge Township | Piatt County | 5 | 1,226 |
| Bluff Springs Township | Cass County | 4 | 680 |
| Bluffdale Township | Greene County | 3 | 624 |
| Bluffs | Scott County | 1 | 761 |
| Bluford | Jefferson County | 1 | 655 |
| Bois D'Arc Township | Montgomery County | 4 | 796 |
| Bolingbrook | Will County | 2 | 73,383 |
| Bolo Township | Washington County | 4 | 399 |
| Bond Township | Lawrence County | 2 | 865 |
| Bondville | Champaign County | 1 | 620 |
| Bone Gap | Edwards County | 1 | 210 |
| Bonfield | Kankakee County | 1 | 277 |
| Bonnie | Jefferson County | 1 | 448 |
| Bonnie Brae | Will County | 1 | 1,248 |
| Bonpas Township | Richland County | 4 | 211 |
| Bonus Township | Boone County | 4 | 4,386 |
| Boody | Macon County | 1 | 219 |
| Boone Township | Boone County | 3 | 2,157 |
| Boulder Hill | Kendall County | 2 | 8,532 |
| Bourbon Township | Douglas County | 3 | 4,104 |
| Bourbonnais | Kankakee County | 1 | 18,582 |
| Bourbonnais Township | Kankakee County | 3 | 39,696 |
| Bowdre Township | Douglas County | 5 | 774 |
| Bowen | Hancock County | 1 | 596 |
| Bowlesville Township | Gallatin County | 4 | 32 |
| Bowling Green Township | Fayette County | 3 | 307 |
| Bowling Township | Rock Island County | 3 | 3,374 |
| Boynton Township | Tazewell County | 2 | 269 |
| Braceville | Grundy County | 1 | 848 |
| Braceville Township | Grundy County | 4 | 6,473 |
| Bradford | Stark County | 1 | 861 |
| Bradford Township | Lee County | 4 | 237 |
| Bradley | Kankakee County | 1 | 15,777 |
| Bradley Township | Jackson County | 3 | 1,551 |
| Braidwood | Will County | 1 | 6,047 |
| Breese | Clinton County | 1 | 4,805 |
| Breese Township | Clinton County | 4 | 5,526 |
| Bremen Township | Cook County | 14 | 107,398 |
| Brenton Township | Ford County | 2 | 899 |
| Bridgeport | Lawrence County | 1 | 1,335 |
| Bridgeport Township | Lawrence County | 1 | 2,038 |
| Bridgeview | Cook County | 1 | 16,394 |
| Brighton | Macoupin County | 1 | 2,084 |
| Brighton Township | Macoupin County | 4 | 3,927 |
| Brimfield | Peoria County | 1 | 910 |
| Brimfield Township | Peoria County | 2 | 1,226 |
| Bristol Township | Kendall County | 6 | 31,558 |
| Broadlands | Champaign County | 1 | 304 |
| Broadview | Cook County | 1 | 7,938 |
| Broadwell | Logan County | 1 | 70 |
| Broadwell Township | Logan County | 3 | 3,070 |
| Brocton | Edgar County | 1 | 428 |
| Brookfield | Cook County | 1 | 18,812 |
| Brookfield Township | LaSalle County | 4 | 818 |
| Brooklyn | Saint Clair County | 5 | 669 |
| Brooklyn Township (Lee County) | Lee County | 4 | 632 |
| Brooklyn Township (Schuyler County) | Schuyler County | 1 | 179 |
| Brookport | Massac County | 1 | 922 |
| Brookside Township | Clinton County | 1 | 4,651 |
| Brookville Township | Ogle County | 3 | 344 |
| Broughton | Hamilton County | 1 | 294 |
| Broughton Township | Livingston County | 5 | 293 |
| Brouilletts Creek Township | Edgar County | 1 | 201 |
| Brown Township | Champaign County | 2 | 1,820 |
| Browning | Schuyler County | 1 | 163 |
| Browning Township (Franklin County) | Franklin County | 5 | 2,096 |
| Browning Township (Schuyler County) | Schuyler County | 1 | 278 |
| Browns | Edwards County | 1 | 108 |
| Brownstown | Fayette County | 1 | 741 |
| Bruce Township | LaSalle County | 1 | 12,039 |
| Brushy Mound Township | Macoupin County | 3 | 586 |
| Brushy Township | Saline County | 4 | 868 |
| Brussels | Calhoun County | 1 | 151 |
| Bryant | Fulton County | 1 | 186 |
| Buck Township | Edgar County | 3 | 288 |
| Buckeye Township | Stephenson County | 4 | 1,173 |
| Buckhart Township | Christian County | 3 | 2,120 |
| Buckheart Township | Fulton County | 5 | 1,356 |
| Buckhorn Township | Brown County | 3 | 297 |
| Buckingham | Kankakee County | 1 | 317 |
| Buckley | Iroquois County | 1 | 579 |
| Buckner | Franklin County | 1 | 398 |
| Buda | Bureau County | 1 | 588 |
| Buena Vista Township | Schuyler County | 1 | 2,151 |
| Buffalo | Sangamon County | 1 | 392 |
| Buffalo Grove | Lake County | 1 | 41,667 |
| Buffalo Hart Township | Sangamon County | 3 | 222 |
| Buffalo Prairie | Rock Island County | 2 | 27 |
| Buffalo Prairie Township | Rock Island County | 3 | 710 |
| Buffalo Township | Ogle County | 1 | 2,683 |
| Bull Valley | Mchenry County | 4 | 1,003 |
| Bulpitt | Christian County | 1 | 338 |
| Buncombe | Johnson County | 1 | 213 |
| Bunker Hill | Macoupin County | 1 | 1,719 |
| Bunker Hill Township | Macoupin County | 4 | 3,166 |
| Burbank | Cook County | 1 | 28,851 |
| Bureau Junction | Bureau County | 2 | 301 |
| Bureau Township | Bureau County | 3 | 188 |
| Burgess Township | Bond County | 3 | 2,249 |
| Burlington | Kane County | 1 | 547 |
| Burlington Township | Kane County | 5 | 1,876 |
| Burnham | Cook County | 2 | 4,208 |
| Burns Township | Henry County | 3 | 179 |
| Burnt Prairie | White County | 1 | 67 |
| Burnt Prairie Township | White County | 5 | 504 |
| Burr Ridge | DuPage County | 4 | 10,590 |
| Burritt Township | Winnebago County | 4 | 1,207 |
| Burton | Adams County | 2 | 41 |
| Burton Township (Adams County) | Adams County | 3 | 706 |
| Burton Township (Mchenry County) | Mchenry County | 4 | 4,913 |
| Burtons Bridge | Mchenry County | 3 | 273 |
| Bush | Williamson County | 2 | 266 |
| Bushnell | Mcdonough County | 1 | 3,079 |
| Bushnell Township | Mcdonough County | 2 | 2,920 |
| Butler | Montgomery County | 1 | 131 |
| Butler Grove Township | Montgomery County | 3 | 824 |
| Butler Township | Vermilion County | 4 | 1,202 |
| Button Township | Ford County | 2 | 254 |
| Byron | Ogle County | 1 | 3,709 |
| Byron Township | Ogle County | 5 | 6,428 |
| Cabery | Kankakee County | 1 | 327 |
| Cable | Mercer County | 1 | 103 |
| Cahokia Township | Macoupin County | 5 | 3,202 |
| Cairo | Alexander County | 1 | 2,812 |
| Caledonia | Boone County | 1 | 233 |
| Caledonia Township | Boone County | 4 | 7,330 |
| Calhoun | Richland County | 1 | 167 |
| Calumet City | Cook County | 1 | 37,070 |
| Calumet Park | Cook County | 3 | 7,913 |
| Calumet Township | Cook County | 4 | 18,810 |
| Camargo | Douglas County | 1 | 502 |
| Camargo Township | Douglas County | 3 | 3,512 |
| Cambria | Williamson County | 1 | 1,305 |
| Cambridge | Henry County | 1 | 2,319 |
| Cambridge Township | Henry County | 2 | 2,399 |
| Camden | Schuyler County | 1 | 144 |
| Camden Township | Schuyler County | 4 | 176 |
| Cameron | Warren County | 1 | 146 |
| Camp Point | Adams County | 1 | 1,420 |
| Camp Point Township | Adams County | 3 | 1,732 |
| Campbell Hill | Jackson County | 1 | 281 |
| Campbell's Island | Rock Island County | 1 | 343 |
| Campton Hills | Kane County | 5 | 10,985 |
| Campton Township | Kane County | 5 | 17,131 |
| Campus | Livingston County | 1 | 133 |
| Candlewick Lake | Boone County | 1 | 4,402 |
| Canoe Creek Township | Rock Island County | 2 | 610 |
| Canteen Township | Saint Clair County | 9 | 8,255 |
| Canton | Fulton County | 1 | 14,699 |
| Canton Township | Fulton County | 3 | 14,674 |
| Cantrall | Sangamon County | 1 | 171 |
| Capital Township | Sangamon County | 11 | 113,229 |
| Capron | Boone County | 1 | 1,445 |
| Carbon Cliff | Rock Island County | 1 | 2,189 |
| Carbon Hill | Grundy County | 1 | 486 |
| Carbondale | Jackson County | 3 | 25,961 |
| Carbondale Township | Jackson County | 5 | 25,234 |
| Carlinville | Macoupin County | 1 | 5,799 |
| Carlinville Township | Macoupin County | 2 | 6,458 |
| Carlock | Mclean County | 1 | 752 |
| Carlyle | Clinton County | 1 | 3,265 |
| Carlyle Township | Clinton County | 1 | 3,839 |
| Carman | Henderson County | 1 | 187 |
| Carman Township | Henderson County | 2 | 288 |
| Carmi | White County | 1 | 5,351 |
| Carmi Township | White County | 2 | 6,344 |
| Carol Stream | DuPage County | 1 | 39,869 |
| Carpentersville | Kane County | 1 | 37,758 |
| Carrier Mills | Saline County | 1 | 1,702 |
| Carrier Mills Township | Saline County | 3 | 2,321 |
| Carrigan Township | Marion County | 3 | 516 |
| Carroll Township | Vermilion County | 5 | 441 |
| Carrollton | Greene County | 1 | 2,576 |
| Carrollton Township | Greene County | 2 | 2,891 |
| Carson Township | Fayette County | 2 | 166 |
| Carterville | Williamson County | 1 | 5,485 |
| Carthage | Hancock County | 1 | 2,618 |
| Carthage Township | Hancock County | 1 | 2,971 |
| Cartwright Township | Sangamon County | 2 | 1,175 |
| Cary | Mchenry County | 1 | 18,202 |
| Casey | Clark County | 1 | 2,618 |
| Casey Township | Clark County | 2 | 3,530 |
| Caseyville | Saint Clair County | 1 | 4,349 |
| Caseyville Township | Saint Clair County | 7 | 35,113 |
| Casner Township | Jefferson County | 2 | 1,087 |
| Cass Township | Fulton County | 3 | 507 |
| Catlin | Vermilion County | 1 | 2,142 |
| Catlin Township | Vermilion County | 5 | 3,125 |
| Cave Township | Franklin County | 2 | 1,758 |
| Cave-In-Rock | Hardin County | 1 | 251 |
| Cazenovia Township | Woodford County | 2 | 1,895 |
| Cedar Point | LaSalle County | 1 | 255 |
| Cedar Township | Knox County | 3 | 3,065 |
| Cedarville | Stephenson County | 1 | 753 |
| Central City | Marion County | 1 | 1,194 |
| Central Township | Bond County | 2 | 7,546 |
| Centralia | Marion County | 1 | 13,019 |
| Centralia Township | Marion County | 3 | 14,350 |
| Centreville Township | Saint Clair County | 9 | 20,760 |
| Cerro Gordo | Piatt County | 1 | 1,324 |
| Cerro Gordo Township | Piatt County | 5 | 2,002 |
| Chadwick | Carroll County | 1 | 436 |
| Chalmers Township | Mcdonough County | 2 | 640 |
| Chambersburg Township | Pike County | 2 | 152 |
| Champaign | Champaign County | 3 | 81,083 |
| Champaign City Township | Champaign County | 5 | 88,343 |
| Champaign Township | Champaign County | 4 | 11,249 |
| Chandlerville | Cass County | 1 | 744 |
| Chandlerville Township | Cass County | 4 | 531 |
| Channahon | Grundy County | 1 | 12,377 |
| Channahon Township | Will County | 5 | 10,560 |
| Channel Lake | Lake County | 1 | 1,709 |
| Chapin | Morgan County | 1 | 613 |
| Charleston | Coles County | 1 | 21,952 |
| Charleston Township | Coles County | 4 | 19,897 |
| Charlotte Township | Livingston County | 4 | 114 |
| Chatham | Sangamon County | 1 | 11,807 |
| Chatham Township | Sangamon County | 4 | 8,256 |
| Chatsworth | Livingston County | 1 | 1,214 |
| Chatsworth Township | Livingston County | 2 | 1,484 |
| Chebanse | Kankakee County | 1 | 1,207 |
| Chebanse Township | Iroquois County | 5 | 2,910 |
| Chemung | Mchenry County | 1 | 213 |
| Chemung Township | Mchenry County | 1 | 9,108 |
| Cheney's Grove Township | Mclean County | 2 | 971 |
| Chenoa | Mclean County | 1 | 1,861 |
| Chenoa Township | Mclean County | 2 | 1,998 |
| Cherry | Bureau County | 1 | 340 |
| Cherry Grove-Shannon Township | Carroll County | 4 | 1,516 |
| Cherry Valley | Winnebago County | 1 | 3,203 |
| Cherry Valley Township | Winnebago County | 4 | 19,304 |
| Chester | Randolph County | 1 | 8,523 |
| Chester Township | Logan County | 3 | 603 |
| Chesterfield | Macoupin County | 1 | 168 |
| Chesterfield Township | Macoupin County | 4 | 661 |
| Chestnut | Logan County | 1 | 155 |
| Chestnut Township | Knox County | 6 | 109 |
| Chicago | Cook County | 57 | 2,702,471 |
| Chicago Heights | Cook County | 1 | 30,328 |
| Chicago Ridge | Cook County | 1 | 14,303 |
| Chili Township | Hancock County | 3 | 786 |
| Chillicothe | Peoria County | 1 | 6,139 |
| Chillicothe Township | Peoria County | 1 | 8,274 |
| Chouteau Township | Madison County | 7 | 7,681 |
| Chrisman | Edgar County | 1 | 1,320 |
| Christopher | Franklin County | 1 | 2,629 |
| Christy Township | Lawrence County | 1 | 3,467 |
| Cicero | Cook County | 1 | 83,756 |
| Cicero Township | Cook County | 2 | 84,905 |
| Cincinnati Township (Pike County) | Pike County | 3 | 34 |
| Cincinnati Township (Tazewell County) | Tazewell County | 3 | 8,943 |
| Cisco | Piatt County | 1 | 283 |
| Cisne | Wayne County | 1 | 756 |
| Cissna Park | Iroquois County | 1 | 882 |
| Claremont | Richland County | 1 | 202 |
| Claremont Township | Richland County | 2 | 857 |
| Clarendon Hills | DuPage County | 1 | 8,434 |
| Clarion Township | Bureau County | 3 | 260 |
| Clarksburg Township | Shelby County | 1 | 446 |
| Clay City | Clay County | 1 | 903 |
| Clay City Township | Clay County | 4 | 1,148 |
| Clayton | Adams County | 1 | 642 |
| Clayton Township (Adams County) | Adams County | 4 | 782 |
| Clayton Township (Woodford County) | Woodford County | 3 | 676 |
| Clear Lake | Sangamon County | 1 | 248 |
| Clear Lake Township | Sangamon County | 8 | 8,404 |
| Clement Township | Clinton County | 2 | 268 |
| Cleveland | Henry County | 1 | 203 |
| Clifton | Iroquois County | 1 | 1,483 |
| Clinton | De Witt County | 1 | 7,007 |
| Clinton Township | DeKalb County | 3 | 2,311 |
| Clintonia Township | De Witt County | 1 | 7,418 |
| Clover Township | Henry County | 3 | 931 |
| Clyde Township | Whiteside County | 3 | 512 |
| Coal City | Grundy County | 1 | 5,346 |
| Coal Valley | Rock Island County | 1 | 3,733 |
| Coal Valley Township | Rock Island County | 3 | 4,433 |
| Coalton | Montgomery County | 1 | 276 |
| Coatsburg | Adams County | 1 | 144 |
| Cobden | Union County | 1 | 1,322 |
| Coe Township | Rock Island County | 3 | 1,734 |
| Coffeen | Montgomery County | 1 | 460 |
| Colchester | Mcdonough County | 1 | 1,274 |
| Colchester Township | Mcdonough County | 1 | 1,645 |
| Cold Spring Township | Shelby County | 3 | 566 |
| Coldbrook Township | Warren County | 3 | 319 |
| Coleta | Whiteside County | 2 | 184 |
| Colfax | Mclean County | 1 | 1,038 |
| Colfax Township | Champaign County | 6 | 136 |
| Collinsville | Madison County | 1 | 25,370 |
| Collinsville Township | Madison County | 6 | 35,878 |
| Coloma Township | Whiteside County | 2 | 10,649 |
| Colona | Henry County | 1 | 5,013 |
| Colona Township | Henry County | 4 | 6,732 |
| Colp | Williamson County | 1 | 236 |
| Columbia | Monroe County | 1 | 9,687 |
| Columbus | Adams County | 2 | 108 |
| Columbus Township | Adams County | 2 | 695 |
| Como | Whiteside County | 2 | 429 |
| Compromise Township | Champaign County | 7 | 1,482 |
| Compton | Lee County | 1 | 320 |
| Concord | Morgan County | 1 | 155 |
| Concord Township (Adams County) | Adams County | 2 | 629 |
| Concord Township (Bureau County) | Bureau County | 3 | 1,608 |
| Concord Township (Iroquois County) | Iroquois County | 4 | 408 |
| Condit Township | Champaign County | 5 | 404 |
| Congerville | Woodford County | 1 | 518 |
| Cooksville | Mclean County | 1 | 158 |
| Cooper Township | Sangamon County | 4 | 896 |
| Cooperstown Township | Brown County | 1 | 261 |
| Copley Township | Knox County | 5 | 440 |
| Coral | Mchenry County | 2 | 0 |
| Coral Township | Mchenry County | 4 | 3,626 |
| Cordova | Rock Island County | 1 | 686 |
| Cordova Township | Rock Island County | 4 | 870 |
| Cornell | Livingston County | 1 | 442 |
| Cornland | Logan County | 1 | 58 |
| Cornwall Township | Henry County | 5 | 345 |
| Cortland | DeKalb County | 1 | 4,280 |
| Cortland Township | DeKalb County | 4 | 11,155 |
| Corwin Township | Logan County | 3 | 467 |
| Cottage Township | Saline County | 3 | 171 |
| Cotton Hill Township | Sangamon County | 3 | 1,242 |
| Cottonwood Township | Cumberland County | 4 | 565 |
| Coulterville | Randolph County | 1 | 921 |
| Council Hill Township | Jo Daviess County | 3 | 135 |
| Country Club Hills | Cook County | 1 | 16,540 |
| Countryside | Cook County | 1 | 5,905 |
| Covington Township | Washington County | 5 | 313 |
| Cowden | Shelby County | 1 | 604 |
| Coyne Center | Rock Island County | 1 | 943 |
| Crab Orchard | Williamson County | 1 | 292 |
| Crainville | Williamson County | 1 | 1,230 |
| Crane Creek Township | Mason County | 2 | 76 |
| Creal Springs | Williamson County | 1 | 692 |
| Creek Township | De Witt County | 4 | 423 |
| Crescent City | Iroquois County | 1 | 581 |
| Crescent Township | Iroquois County | 5 | 520 |
| Crest Hill | Will County | 1 | 20,724 |
| Creston | Ogle County | 1 | 695 |
| Crestwood | Cook County | 1 | 10,951 |
| Crete | Will County | 1 | 8,336 |
| Crete Township | Will County | 7 | 23,769 |
| Creve Coeur | Tazewell County | 1 | 5,460 |
| Crittenden Township | Champaign County | 4 | 415 |
| Crook Township | Hamilton County | 2 | 400 |
| Crooked Creek Township (Cumberland County) | Cumberland County | 2 | 290 |
| Crooked Creek Township (Jasper County) | Jasper County | 3 | 782 |
| Cropsey Township | Mclean County | 2 | 126 |
| Crossville | White County | 1 | 766 |
| Crouch Township | Hamilton County | 2 | 440 |
| Cruger Township | Woodford County | 1 | 1,982 |
| Crystal Lake | Mchenry County | 2 | 40,867 |
| Crystal Lawns | Will County | 3 | 1,941 |
| Cuba | Fulton County | 1 | 1,509 |
| Cuba Township | Lake County | 5 | 17,286 |
| Cullom | Livingston County | 1 | 538 |
| Cunningham Township | Champaign County | 3 | 39,189 |
| Curran | Sangamon County | 1 | 191 |
| Curran Township | Sangamon County | 5 | 1,437 |
| Custer Park | Will County | 1 | 497 |
| Custer Township | Will County | 2 | 1,637 |
| Cutler | Perry County | 1 | 504 |
| Cypress | Johnson County | 1 | 351 |
| Dahlgren | Hamilton County | 1 | 434 |
| Dahlgren Township | Hamilton County | 4 | 1,132 |
| Dakota | Stephenson County | 1 | 717 |
| Dakota Township | Stephenson County | 3 | 899 |
| Dale Township | Mclean County | 3 | 1,257 |
| Dallas City | Hancock County | 1 | 1,160 |
| Dallas City Township | Hancock County | 2 | 864 |
| Dalton City | Moultrie County | 1 | 460 |
| Dalzell | Bureau County | 1 | 741 |
| Damiansville | Clinton County | 1 | 526 |
| Dana | LaSalle County | 1 | 207 |
| Danforth | Iroquois County | 1 | 601 |
| Danforth Township | Iroquois County | 4 | 770 |
| Danvers | Mclean County | 1 | 1,026 |
| Danvers Township | Mclean County | 2 | 1,620 |
| Danville | Vermilion County | 2 | 32,977 |
| Danville Township | Vermilion County | 6 | 27,963 |
| Darien | DuPage County | 1 | 22,163 |
| Darmstadt | Saint Clair County | 1 | 0 |
| Darwin Township | Clark County | 2 | 525 |
| Davis | Stephenson County | 1 | 910 |
| Davis Junction | Ogle County | 1 | 2,723 |
| Dawson | Sangamon County | 1 | 534 |
| Dawson Township | Mclean County | 5 | 648 |
| Dayton | LaSalle County | 1 | 541 |
| Dayton Township | LaSalle County | 3 | 2,686 |
| De Land | Piatt County | 1 | 508 |
| De Pue | Bureau County | 3 | 1,887 |
| De Soto | Jackson County | 1 | 1,478 |
| De Soto Township | Jackson County | 4 | 2,326 |
| De Witt | De Witt County | 1 | 184 |
| De Witt Township | De Witt County | 4 | 563 |
| DeKalb | DeKalb County | 1 | 44,340 |
| DeKalb Township | DeKalb County | 3 | 43,351 |
| Decatur | Macon County | 4 | 76,091 |
| Decatur Township | Macon County | 4 | 48,211 |
| Decker Township | Richland County | 4 | 420 |
| Deer Creek | Tazewell County | 1 | 765 |
| Deer Creek Township | Tazewell County | 5 | 1,209 |
| Deer Grove | Whiteside County | 1 | 81 |
| Deer Park | Lake County | 3 | 3,220 |
| Deer Park Township | LaSalle County | 4 | 533 |
| Deerfield | Lake County | 1 | 18,452 |
| Deerfield Township | Fulton County | 4 | 175 |
| Degognia Township | Jackson County | 4 | 120 |
| Delavan | Tazewell County | 1 | 1,568 |
| Delavan Township | Tazewell County | 1 | 2,125 |
| Dement Township | Ogle County | 1 | 872 |
| Denison Township | Lawrence County | 3 | 1,031 |
| Denning Township | Franklin County | 4 | 4,816 |
| Denver Township | Richland County | 4 | 595 |
| Derinda Township | Jo Daviess County | 4 | 235 |
| Derry Township | Pike County | 4 | 401 |
| Des Plaines | Cook County | 2 | 58,302 |
| Detroit | Pike County | 1 | 125 |
| Detroit Township | Pike County | 1 | 188 |
| Dewey | Champaign County | 1 | 90 |
| Diamond | Grundy County | 3 | 2,648 |
| Dieterich | Effingham County | 1 | 574 |
| Dillon Township | Tazewell County | 4 | 792 |
| Dimmick Township | LaSalle County | 4 | 518 |
| Divernon | Sangamon County | 1 | 1,495 |
| Divernon Township | Sangamon County | 3 | 1,370 |
| Dix | Jefferson County | 1 | 524 |
| Dix Township | Ford County | 4 | 484 |
| Dixmoor | Cook County | 4 | 3,643 |
| Dixon | Lee County | 1 | 15,332 |
| Dixon Township | Lee County | 1 | 17,559 |
| Dodds Township | Jefferson County | 4 | 2,709 |
| Dolson Township | Clark County | 2 | 283 |
| Dolton | Cook County | 1 | 23,230 |
| Dongola | Union County | 1 | 878 |
| Donnellson | Montgomery County | 1 | 227 |
| Donovan | Iroquois County | 1 | 355 |
| Dora Township | Moultrie County | 2 | 781 |
| Dorchester | Macoupin County | 1 | 146 |
| Dorchester Township | Macoupin County | 5 | 1,559 |
| Dorr Township | Mchenry County | 4 | 21,517 |
| Douglas Township (Clark County) | Clark County | 2 | 348 |
| Douglas Township (Effingham County) | Effingham County | 3 | 12,630 |
| Douglas Township (Iroquois County) | Iroquois County | 5 | 1,817 |
| Dover | Bureau County | 1 | 132 |
| Dover Township | Bureau County | 3 | 348 |
| Dowell | Jackson County | 1 | 293 |
| Downers Grove | DuPage County | 2 | 48,621 |
| Downers Grove Township | DuPage County | 10 | 150,066 |
| Downs | Mclean County | 1 | 889 |
| Downs Township | Mclean County | 4 | 1,370 |
| Drummer Township | Ford County | 2 | 4,021 |
| Drury Township | Rock Island County | 3 | 890 |
| Dry Grove Township | Mclean County | 4 | 1,386 |
| Dry Point Township | Shelby County | 3 | 876 |
| Du Bois | Washington County | 1 | 189 |
| Du Bois Township | Washington County | 2 | 595 |
| Du Page Township | Will County | 8 | 87,645 |
| Du Quoin | Perry County | 1 | 6,089 |
| Duncan Township | Mercer County | 3 | 334 |
| Dundas | Richland County | 1 | 259 |
| Dundee Township | Kane County | 9 | 64,908 |
| Dunfermline | Fulton County | 1 | 221 |
| Dunham Township | Mchenry County | 3 | 2,794 |
| Dunlap | Peoria County | 1 | 1,588 |
| Dunleith Township | Jo Daviess County | 3 | 3,555 |
| Dupo | Saint Clair County | 1 | 4,091 |
| Durand | Winnebago County | 1 | 1,379 |
| Durand Township | Winnebago County | 3 | 2,561 |
| Durham Township | Hancock County | 2 | 135 |
| Dwight | Livingston County | 1 | 4,103 |
| Dwight Township | Livingston County | 1 | 4,241 |
| Eagarville | Macoupin County | 1 | 65 |
| Eagle Creek Township | Gallatin County | 4 | 202 |
| Eagle Lake | Will County | 1 | 61 |
| Eagle Point Township | Ogle County | 3 | 418 |
| Eagle Township | LaSalle County | 2 | 1,528 |
| Earl Township | LaSalle County | 2 | 2,716 |
| Earlville | LaSalle County | 1 | 1,803 |
| East Alton | Madison County | 1 | 6,309 |
| East Bend Township | Champaign County | 5 | 845 |
| East Brooklyn | Grundy County | 1 | 92 |
| East Cape Girardeau | Alexander County | 1 | 669 |
| East Carondelet | Saint Clair County | 1 | 437 |
| East Dubuque | Jo Daviess County | 1 | 1,973 |
| East Dundee | Kane County | 2 | 2,886 |
| East Eldorado Township | Saline County | 2 | 5,479 |
| East Fork Township (Clinton County) | Clinton County | 3 | 353 |
| East Fork Township (Montgomery County) | Montgomery County | 4 | 3,171 |
| East Galena Township | Jo Daviess County | 1 | 1,192 |
| East Galesburg | Knox County | 1 | 805 |
| East Gillespie | Macoupin County | 1 | 204 |
| East Grove Township | Lee County | 3 | 254 |
| East Hazel Crest | Cook County | 3 | 1,853 |
| East Lincoln Township | Logan County | 4 | 7,767 |
| East Lynn | Vermilion County | 2 | 379 |
| East Moline | Rock Island County | 1 | 21,585 |
| East Nelson Township | Moultrie County | 1 | 785 |
| East Oakland Township | Coles County | 4 | 1,332 |
| East Peoria | Tazewell County | 2 | 23,321 |
| East St. Louis | Saint Clair County | 9 | 27,116 |
| East St. Louis Township | Saint Clair County | 9 | 19,437 |
| Eastern Township | Franklin County | 3 | 614 |
| Easton | Mason County | 1 | 356 |
| Eddyville | Pope County | 1 | 104 |
| Eden Township | LaSalle County | 4 | 1,282 |
| Edford Township | Henry County | 4 | 771 |
| Edgar Township | Edgar County | 3 | 279 |
| Edgewood | Effingham County | 1 | 389 |
| Edgington | Rock Island County | 1 | 195 |
| Edgington Township | Rock Island County | 3 | 946 |
| Edinburg | Christian County | 1 | 1,069 |
| Edwardsville | Madison County | 2 | 24,093 |
| Edwardsville Township | Madison County | 5 | 38,940 |
| Effingham | Effingham County | 1 | 12,297 |
| El Dara | Pike County | 2 | 167 |
| El Paso | Woodford County | 1 | 2,546 |
| El Paso Township | Woodford County | 1 | 3,436 |
| Ela Township | Lake County | 4 | 45,164 |
| Elba Township | Knox County | 5 | 136 |
| Elbridge Township | Edgar County | 3 | 587 |
| Elburn | Kane County | 1 | 5,595 |
| Eldorado | Saline County | 1 | 4,331 |
| Eldorado Township | Mcdonough County | 4 | 82 |
| Eldred | Greene County | 1 | 155 |
| Elgin | Kane County | 3 | 109,513 |
| Elgin Township | Kane County | 7 | 104,470 |
| Eliza | Mercer County | 1 | 0 |
| Eliza Township | Mercer County | 2 | 466 |
| Elizabeth | Jo Daviess County | 1 | 894 |
| Elizabeth Township | Jo Daviess County | 3 | 1,038 |
| Elizabethtown | Hardin County | 1 | 373 |
| Elk Grove Township | Cook County | 9 | 94,958 |
| Elk Grove Village | Cook County | 1 | 33,166 |
| Elk Prairie Township | Jefferson County | 4 | 582 |
| Elk Township | Jackson County | 5 | 1,420 |
| Elkhart | Logan County | 1 | 291 |
| Elkhart Township | Logan County | 4 | 393 |
| Elkhorn Grove Township | Carroll County | 4 | 213 |
| Elkhorn Township | Brown County | 3 | 289 |
| Elkville | Jackson County | 1 | 1,018 |
| Ellington Township | Adams County | 3 | 2,819 |
| Elliott | Ford County | 1 | 277 |
| Ellis Grove | Randolph County | 1 | 400 |
| Ellison Township | Warren County | 2 | 319 |
| Ellisville | Fulton County | 1 | 119 |
| Ellisville Township | Fulton County | 2 | 119 |
| Ellsworth | Mclean County | 1 | 228 |
| Elm Grove Township | Tazewell County | 3 | 2,984 |
| Elm River Township | Wayne County | 1 | 142 |
| Elmhurst | DuPage County | 1 | 44,385 |
| Elmira Township | Stark County | 2 | 302 |
| Elmwood | Peoria County | 1 | 2,313 |
| Elmwood Park | Cook County | 1 | 24,876 |
| Elmwood Township | Peoria County | 3 | 2,809 |
| Elsah | Jersey County | 1 | 675 |
| Elsah Township | Jersey County | 4 | 2,617 |
| Elvaston | Hancock County | 1 | 122 |
| Elwin | Macon County | 1 | 143 |
| Elwood | Will County | 1 | 2,216 |
| Elwood Township | Vermilion County | 3 | 1,548 |
| Embarrass Township | Edgar County | 4 | 540 |
| Emden | Logan County | 1 | 327 |
| Eminence Township | Logan County | 6 | 315 |
| Emington | Livingston County | 1 | 120 |
| Emma Township | White County | 4 | 391 |
| Emmet Township | Mcdonough County | 5 | 1,235 |
| Empire Township | Mclean County | 1 | 3,991 |
| Energy | Williamson County | 1 | 781 |
| Enfield | White County | 1 | 697 |
| Enfield Township | White County | 2 | 1,117 |
| Engelmann Township | Saint Clair County | 3 | 524 |
| English Township | Jersey County | 2 | 468 |
| Eppards Point Township | Livingston County | 3 | 437 |
| Equality | Gallatin County | 1 | 749 |
| Equality Township | Gallatin County | 3 | 866 |
| Erie | Whiteside County | 1 | 1,675 |
| Erie Township | Whiteside County | 4 | 2,093 |
| Erienna Township | Grundy County | 1 | 2,709 |
| Erin Township | Stephenson County | 3 | 450 |
| Esmen Township | Livingston County | 4 | 328 |
| Essex | Kankakee County | 1 | 822 |
| Essex Township (Kankakee County) | Kankakee County | 5 | 1,599 |
| Essex Township (Stark County) | Stark County | 4 | 684 |
| Eureka | Woodford County | 1 | 5,421 |
| Evans Township | Marshall County | 3 | 1,404 |
| Evanston | Cook County | 4 | 74,619 |
| Evansville | Randolph County | 1 | 637 |
| Evergreen Park | Cook County | 1 | 19,852 |
| Ewing | Franklin County | 1 | 273 |
| Ewing Township | Franklin County | 5 | 1,802 |
| Exeter | Scott County | 1 | 124 |
| Fairbury | Livingston County | 1 | 3,833 |
| Fairfield | Wayne County | 1 | 5,285 |
| Fairfield Township | Bureau County | 2 | 499 |
| Fairhaven Township | Carroll County | 4 | 911 |
| Fairmont | Will County | 1 | 2,277 |
| Fairmont City | Saint Clair County | 6 | 2,596 |
| Fairmount | Vermilion County | 1 | 556 |
| Fairmount Township | Pike County | 2 | 369 |
| Fairview | Fulton County | 1 | 493 |
| Fairview Heights | Saint Clair County | 1 | 16,838 |
| Fairview Township | Fulton County | 2 | 630 |
| Fall Creek | Adams County | 2 | 29 |
| Fall Creek Township | Adams County | 4 | 682 |
| Fall River Township | LaSalle County | 2 | 658 |
| Fancy Creek Township | Sangamon County | 6 | 5,816 |
| Farina | Fayette County | 1 | 552 |
| Farm Ridge Township | LaSalle County | 3 | 1,042 |
| Farmer City | De Witt County | 1 | 2,179 |
| Farmers Township | Fulton County | 1 | 326 |
| Farmersville | Montgomery County | 1 | 634 |
| Farmington | Fulton County | 1 | 2,279 |
| Farmington Township | Fulton County | 5 | 3,191 |
| Farrington Township | Jefferson County | 4 | 549 |
| Fayette Township | Livingston County | 4 | 163 |
| Fayetteville | Saint Clair County | 1 | 416 |
| Fayetteville Township | Saint Clair County | 6 | 1,870 |
| Felix Township | Grundy County | 2 | 4,433 |
| Fenton Township | Whiteside County | 5 | 468 |
| Ferris | Hancock County | 1 | 202 |
| Fidelity | Jersey County | 1 | 145 |
| Fidelity Township | Jersey County | 5 | 745 |
| Field Township | Jefferson County | 4 | 1,547 |
| Fieldon | Jersey County | 1 | 266 |
| Fillmore | Montgomery County | 1 | 429 |
| Fillmore Consolidated Township | Montgomery County | 4 | 742 |
| Findlay | Shelby County | 1 | 956 |
| Fisher | Champaign County | 1 | 2,047 |
| Fithian | Vermilion County | 1 | 475 |
| Flagg Township | Ogle County | 2 | 13,297 |
| Flanagan | Livingston County | 1 | 992 |
| Flannigan Township | Hamilton County | 2 | 113 |
| Flat Branch Township | Shelby County | 2 | 261 |
| Flat Rock | Crawford County | 1 | 425 |
| Flint Township | Pike County | 1 | 71 |
| Flora | Clay County | 1 | 5,018 |
| Flora Township | Boone County | 4 | 2,990 |
| Floraville | Saint Clair County | 1 | 0 |
| Florence | Pike County | 1 | 28 |
| Florence Township (Stephenson County) | Stephenson County | 4 | 1,301 |
| Florence Township (Will County) | Will County | 2 | 836 |
| Flossmoor | Cook County | 1 | 9,387 |
| Floyd Township | Warren County | 5 | 510 |
| Fondulac Township | Tazewell County | 6 | 12,489 |
| Foosland | Champaign County | 1 | 143 |
| Ford Heights | Cook County | 1 | 2,787 |
| Forest City | Mason County | 1 | 285 |
| Forest City Township | Mason County | 4 | 597 |
| Forest Lake | Lake County | 1 | 1,792 |
| Forest Park | Cook County | 1 | 14,194 |
| Forest View | Cook County | 2 | 804 |
| Forrest | Livingston County | 1 | 1,133 |
| Forrest Township | Livingston County | 3 | 1,368 |
| Forreston | Ogle County | 1 | 1,582 |
| Forreston Township | Ogle County | 3 | 1,984 |
| Forsyth | Macon County | 1 | 3,785 |
| Fort Russell Township | Madison County | 5 | 9,316 |
| Foster Township (Madison County) | Madison County | 5 | 3,933 |
| Foster Township (Marion County) | Marion County | 4 | 457 |
| Fountain Bluff Township | Jackson County | 5 | 172 |
| Fountain Creek Township | Iroquois County | 4 | 279 |
| Fountain Green Township | Hancock County | 4 | 233 |
| Four Mile Township | Wayne County | 3 | 396 |
| Fowler | Adams County | 1 | 86 |
| Fox Lake | Lake County | 1 | 10,768 |
| Fox Lake Hills | Lake County | 3 | 2,347 |
| Fox River Grove | Mchenry County | 1 | 4,729 |
| Fox Township (Jasper County) | Jasper County | 2 | 575 |
| Fox Township (Kendall County) | Kendall County | 6 | 1,703 |
| Frankfort | Will County | 1 | 17,787 |
| Frankfort Square | Will County | 1 | 9,123 |
| Frankfort Township (Franklin County) | Franklin County | 3 | 6,485 |
| Frankfort Township (Will County) | Will County | 6 | 59,649 |
| Franklin | Morgan County | 1 | 664 |
| Franklin Grove | Lee County | 1 | 1,171 |
| Franklin Grove Township | Lee County | 2 | 1,443 |
| Franklin Park | Cook County | 1 | 18,333 |
| Franklin Township | DeKalb County | 4 | 2,175 |
| Franklinville | Mchenry County | 1 | 0 |
| Frederick Township | Schuyler County | 2 | 135 |
| Freeburg | Saint Clair County | 1 | 4,549 |
| Freeburg Township | Saint Clair County | 4 | 5,069 |
| Freedom Township (Carroll County) | Carroll County | 3 | 553 |
| Freedom Township (LaSalle County) | LaSalle County | 4 | 507 |
| Freeman Spur | Williamson County | 1 | 308 |
| Freeport | Stephenson County | 1 | 25,529 |
| Freeport Township | Stephenson County | 1 | 24,087 |
| Fremont Township | Lake County | 7 | 33,386 |
| Friends Creek Township | Macon County | 4 | 1,372 |
| Fulton | Whiteside County | 1 | 3,587 |
| Fulton Township | Whiteside County | 2 | 4,344 |
| Fults | Monroe County | 1 | 37 |
| Funks Grove Township | Mclean County | 3 | 404 |
| Gages Lake | Lake County | 3 | 9,736 |
| Galatia | Saline County | 1 | 939 |
| Galatia Township | Saline County | 3 | 1,252 |
| Galena | Jo Daviess County | 1 | 3,469 |
| Galesburg | Knox County | 1 | 32,038 |
| Galesburg City Township | Knox County | 3 | 30,298 |
| Galesburg Township | Knox County | 1 | 253 |
| Galt | Whiteside County | 1 | 204 |
| Galva | Henry County | 1 | 2,606 |
| Galva Township | Henry County | 1 | 2,728 |
| Ganeer Township | Kankakee County | 5 | 3,055 |
| Garden Hill Township | Wayne County | 3 | 223 |
| Garden Plain Township | Whiteside County | 5 | 809 |
| Garden Prairie | Boone County | 1 | 243 |
| Gardner | Grundy County | 1 | 1,343 |
| Gardner Township | Sangamon County | 7 | 4,601 |
| Garfield Township | Grundy County | 1 | 1,475 |
| Garrett | Douglas County | 1 | 171 |
| Garrett Township | Douglas County | 3 | 1,223 |
| Gays | Moultrie County | 1 | 307 |
| Genesee Township | Whiteside County | 3 | 789 |
| Geneseo | Henry County | 1 | 6,604 |
| Geneseo Township | Henry County | 1 | 7,548 |
| Geneva | Kane County | 1 | 21,588 |
| Geneva Township | Kane County | 3 | 26,503 |
| Genoa | DeKalb County | 1 | 5,693 |
| Genoa Township | DeKalb County | 4 | 5,528 |
| Georgetown | Vermilion County | 1 | 3,464 |
| Georgetown (Mcdonough County) | Mcdonough County | 1 | 388 |
| Georgetown Township | Vermilion County | 3 | 7,475 |
| German Township | Richland County | 3 | 238 |
| German Valley | Stephenson County | 1 | 563 |
| Germantown | Clinton County | 1 | 1,199 |
| Germantown Hills | Woodford County | 2 | 3,406 |
| Germantown Township | Clinton County | 5 | 2,077 |
| Germanville Township | Livingston County | 2 | 122 |
| Gibson City | Ford County | 1 | 3,466 |
| Gifford | Champaign County | 1 | 918 |
| Gilberts | Kane County | 1 | 6,786 |
| Gillespie | Macoupin County | 1 | 3,308 |
| Gillespie Township | Macoupin County | 4 | 3,683 |
| Gilman | Iroquois County | 1 | 1,859 |
| Gilmer Township | Adams County | 5 | 1,069 |
| Gilson | Knox County | 1 | 154 |
| Girard | Macoupin County | 1 | 2,253 |
| Girard Township | Macoupin County | 1 | 2,335 |
| Gladstone | Henderson County | 1 | 316 |
| Gladstone Township | Henderson County | 2 | 788 |
| Glasford | Peoria County | 1 | 1,016 |
| Glasgow | Scott County | 1 | 159 |
| Glen Carbon | Madison County | 1 | 13,129 |
| Glen Ellyn | DuPage County | 1 | 27,503 |
| Glencoe | Cook County | 1 | 8,728 |
| Glendale Heights | DuPage County | 1 | 34,159 |
| Glenview | Cook County | 2 | 44,478 |
| Glenwood | Cook County | 1 | 9,033 |
| Godfrey | Madison County | 1 | 17,941 |
| Godley | Will County | 2 | 755 |
| Golconda | Pope County | 1 | 788 |
| Gold Hill Township | Gallatin County | 3 | 1,531 |
| Gold Township | Bureau County | 3 | 229 |
| Golden | Adams County | 1 | 664 |
| Golden Gate | Wayne County | 1 | 75 |
| Golf | Cook County | 1 | 590 |
| Good Hope | Mcdonough County | 1 | 419 |
| Goode Township | Franklin County | 5 | 2,641 |
| Goodenow | Will County | 1 | 81 |
| Goodfarm Township | Grundy County | 3 | 253 |
| Goodfield | Woodford County | 1 | 1,039 |
| Goofy Ridge | Mason County | 2 | 266 |
| Goose Creek Township | Piatt County | 4 | 897 |
| Goose Lake Township | Grundy County | 4 | 1,330 |
| Goreville | Johnson County | 1 | 1,222 |
| Gorham | Jackson County | 1 | 302 |
| Goshen Township | Stark County | 3 | 530 |
| Grafton | Jersey County | 1 | 747 |
| Grafton Township | Mchenry County | 7 | 56,296 |
| Grand Detour | Ogle County | 2 | 469 |
| Grand Detour Township | Ogle County | 2 | 503 |
| Grand Prairie Township | Jefferson County | 4 | 968 |
| Grand Rapids Township | LaSalle County | 4 | 216 |
| Grand Ridge | LaSalle County | 1 | 545 |
| Grand Tower | Jackson County | 1 | 486 |
| Grand Tower Township | Jackson County | 4 | 646 |
| Grandview | Sangamon County | 1 | 1,531 |
| Grandview Township | Edgar County | 2 | 487 |
| Grandville Township | Jasper County | 5 | 383 |
| Grandwood Park | Lake County | 2 | 5,283 |
| Granite City | Madison County | 1 | 29,916 |
| Granite City Township | Madison County | 2 | 25,490 |
| Grant Park | Kankakee County | 1 | 1,514 |
| Grant Township (Lake County) | Lake County | 7 | 27,997 |
| Grant Township (Vermilion County) | Vermilion County | 2 | 5,660 |
| Grantfork | Madison County | 1 | 339 |
| Granville | Putnam County | 1 | 1,495 |
| Granville Township | Putnam County | 5 | 2,763 |
| Gray Township | White County | 1 | 1,222 |
| Grayslake | Lake County | 1 | 20,943 |
| Grayville | Edwards County | 1 | 1,668 |
| Green Garden Township | Will County | 3 | 3,914 |
| Green Oaks | Lake County | 3 | 3,852 |
| Green Valley | Tazewell County | 1 | 719 |
| Greenbush Township | Warren County | 3 | 706 |
| Greene Township (Mercer County) | Mercer County | 2 | 1,662 |
| Greene Township (Woodford County) | Woodford County | 4 | 502 |
| Greenfield | Greene County | 1 | 1,409 |
| Greenfield Township | Grundy County | 4 | 944 |
| Greenup | Cumberland County | 1 | 1,622 |
| Greenup Township | Cumberland County | 4 | 2,684 |
| Greenview | Menard County | 1 | 770 |
| Greenville | Bond County | 1 | 6,941 |
| Greenville Township | Bureau County | 3 | 450 |
| Greenwood | Mchenry County | 2 | 278 |
| Greenwood Township (Christian County) | Christian County | 4 | 101 |
| Greenwood Township (Mchenry County) | Mchenry County | 2 | 14,145 |
| Gridley | Mclean County | 1 | 1,419 |
| Gridley Township | Mclean County | 3 | 1,747 |
| Griggsville | Pike County | 1 | 1,195 |
| Griggsville Township | Pike County | 1 | 1,411 |
| Grisham Township | Montgomery County | 5 | 578 |
| Grove Township | Jasper County | 5 | 738 |
| Groveland Township (LaSalle County) | LaSalle County | 2 | 397 |
| Groveland Township (Tazewell County) | Tazewell County | 6 | 18,865 |
| Grover Township | Wayne County | 1 | 3,616 |
| Guilford Township | Jo Daviess County | 3 | 1,401 |
| Gurnee | Lake County | 1 | 31,222 |
| Hadley Township | Pike County | 2 | 117 |
| Hagener Township | Cass County | 2 | 591 |
| Hahnaman Township | Whiteside County | 4 | 402 |
| Haines Township | Marion County | 4 | 1,186 |
| Hainesville | Lake County | 2 | 3,519 |
| Hale Township | Warren County | 3 | 399 |
| Hall Township | Bureau County | 8 | 8,283 |
| Hallock Township | Peoria County | 2 | 1,386 |
| Hamburg | Calhoun County | 1 | 162 |
| Hamel | Madison County | 1 | 685 |
| Hamel Township | Madison County | 3 | 2,760 |
| Hamilton | Hancock County | 1 | 2,828 |
| Hamilton Township | Lee County | 3 | 149 |
| Hamlet | Mercer County | 2 | 0 |
| Hammond | Piatt County | 1 | 390 |
| Hampshire | Kane County | 1 | 6,174 |
| Hampshire Township | Kane County | 3 | 8,818 |
| Hampton | Rock Island County | 1 | 2,196 |
| Hampton Township | Rock Island County | 8 | 21,719 |
| Hanaford | Franklin County | 4 | 217 |
| Hancock Township | Hancock County | 4 | 183 |
| Hanna City | Peoria County | 1 | 1,368 |
| Hanna Township | Henry County | 3 | 2,657 |
| Hanover | Jo Daviess County | 1 | 820 |
| Hanover Park | DuPage County | 1 | 37,990 |
| Hanover Township (Cook County) | Cook County | 10 | 99,821 |
| Hanover Township (Jo Daviess County) | Jo Daviess County | 3 | 1,193 |
| Hardin | Calhoun County | 1 | 1,144 |
| Hardin Township | Pike County | 2 | 86 |
| Harding | LaSalle County | 1 | 153 |
| Harlem Township (Stephenson County) | Stephenson County | 3 | 2,026 |
| Harlem Township (Winnebago County) | Winnebago County | 4 | 39,155 |
| Harmon | Lee County | 1 | 157 |
| Harmon Township | Lee County | 3 | 382 |
| Harmony | Mchenry County | 3 | 0 |
| Harmony Township | Hancock County | 3 | 321 |
| Harp Township | De Witt County | 3 | 353 |
| Harris Township | Fulton County | 3 | 329 |
| Harrisburg | Saline County | 1 | 8,962 |
| Harrisburg Township | Saline County | 2 | 10,149 |
| Harrison | Jackson County | 1 | 1,012 |
| Harrison Township | Winnebago County | 4 | 515 |
| Harristown | Macon County | 1 | 1,540 |
| Harristown Township | Macon County | 5 | 1,693 |
| Harter Township | Clay County | 2 | 6,162 |
| Hartford | Madison County | 1 | 1,541 |
| Hartland | Mchenry County | 1 | 156 |
| Hartland Township | Mchenry County | 3 | 1,566 |
| Hartsburg | Logan County | 1 | 240 |
| Harvard | Mchenry County | 1 | 9,172 |
| Harvel | Montgomery County | 1 | 194 |
| Harvel Township | Montgomery County | 3 | 307 |
| Harvey | Cook County | 1 | 24,959 |
| Harwood Heights | Cook County | 1 | 8,573 |
| Harwood Township | Champaign County | 4 | 721 |
| Havana | Mason County | 1 | 3,281 |
| Havana Township | Mason County | 3 | 4,417 |
| Haw Creek Township | Knox County | 3 | 248 |
| Hawthorn Woods | Lake County | 3 | 7,451 |
| Hawthorne Township | White County | 3 | 201 |
| Hazel Crest | Cook County | 1 | 14,341 |
| Hebron | Mchenry County | 1 | 1,082 |
| Hebron Township | Mchenry County | 4 | 2,471 |
| Hecker | Monroe County | 1 | 475 |
| Helvetia Township | Madison County | 3 | 8,381 |
| Henderson | Knox County | 1 | 334 |
| Henderson Township | Knox County | 5 | 1,550 |
| Hennepin | Putnam County | 1 | 808 |
| Hennepin Township | Putnam County | 4 | 1,550 |
| Henning | Vermilion County | 1 | 348 |
| Henry | Marshall County | 1 | 2,528 |
| Henry Township | Marshall County | 2 | 2,576 |
| Hensley Township | Champaign County | 3 | 721 |
| Heralds Prairie Township | White County | 3 | 393 |
| Heritage Lake | Tazewell County | 1 | 1,374 |
| Herrick | Shelby County | 1 | 354 |
| Herrick Township | Shelby County | 1 | 455 |
| Herrin | Williamson County | 1 | 12,524 |
| Herscher | Kankakee County | 1 | 1,704 |
| Hettick | Macoupin County | 1 | 366 |
| Heyworth | Mclean County | 1 | 2,909 |
| Hickory Hill Township | Wayne County | 2 | 241 |
| Hickory Hills | Cook County | 1 | 14,355 |
| Hickory Point Township | Macon County | 3 | 18,258 |
| Hickory Township | Schuyler County | 2 | 34 |
| Hidalgo | Jasper County | 1 | 136 |
| Highland | Madison County | 1 | 9,434 |
| Highland Park | Lake County | 1 | 29,909 |
| Highland Township | Grundy County | 3 | 255 |
| Highwood | Lake County | 1 | 5,396 |
| Hillcrest | Ogle County | 1 | 1,273 |
| Hillsboro | Montgomery County | 1 | 7,363 |
| Hillsboro Township | Montgomery County | 3 | 6,655 |
| Hillsdale | Rock Island County | 1 | 549 |
| Hillside | Cook County | 1 | 8,136 |
| Hillview | Greene County | 1 | 140 |
| Hillyard Township | Macoupin County | 2 | 637 |
| Hinckley | DeKalb County | 1 | 2,061 |
| Hindsboro | Douglas County | 1 | 322 |
| Hinsdale | DuPage County | 1 | 16,594 |
| Hire Township | Mcdonough County | 3 | 236 |
| Hittle Township | Tazewell County | 1 | 551 |
| Hodgkins | Cook County | 1 | 2,405 |
| Hoffman | Clinton County | 1 | 599 |
| Hoffman Estates | Cook County | 3 | 52,066 |
| Holcomb | Ogle County | 1 | 157 |
| Holiday Hills | Mchenry County | 2 | 686 |
| Holiday Shores | Madison County | 2 | 2,921 |
| Holland Township | Shelby County | 2 | 442 |
| Hollis Township | Peoria County | 3 | 1,776 |
| Hollowayville | Bureau County | 1 | 54 |
| Homer | Champaign County | 1 | 1,073 |
| Homer Glen | Will County | 1 | 24,428 |
| Homer Township | Will County | 7 | 40,673 |
| Hometown | Cook County | 1 | 4,346 |
| Homewood | Cook County | 1 | 19,526 |
| Honey Creek Township (Adams County) | Adams County | 5 | 807 |
| Honey Creek Township (Crawford County) | Crawford County | 2 | 1,789 |
| Honey Point Township | Macoupin County | 2 | 296 |
| Hoopeston | Vermilion County | 1 | 5,601 |
| Hooppole | Henry County | 1 | 307 |
| Hoosier Township | Clay County | 3 | 344 |
| Hope Township | LaSalle County | 3 | 634 |
| Hopedale | Tazewell County | 1 | 1,061 |
| Hopedale Township | Tazewell County | 5 | 1,967 |
| Hopewell | Marshall County | 1 | 428 |
| Hopewell Township | Marshall County | 4 | 734 |
| Hopkins Park | Kankakee County | 1 | 564 |
| Hopkins Township | Whiteside County | 3 | 2,439 |
| Houston Township | Adams County | 4 | 209 |
| Hoyleton | Washington County | 1 | 498 |
| Hoyleton Township | Washington County | 5 | 1,310 |
| Hudson | Mclean County | 1 | 1,944 |
| Hudson Township | Mclean County | 1 | 2,352 |
| Huey | Clinton County | 1 | 202 |
| Hull | Pike County | 1 | 425 |
| Humboldt | Coles County | 1 | 394 |
| Humboldt Township | Coles County | 4 | 947 |
| Hume | Edgar County | 1 | 426 |
| Hume Township | Whiteside County | 5 | 613 |
| Hunt City Township | Jasper County | 4 | 181 |
| Hunter Township | Edgar County | 2 | 126 |
| Huntley | Mchenry County | 1 | 23,897 |
| Huntsville Township | Schuyler County | 1 | 39 |
| Hurlbut Township | Logan County | 3 | 704 |
| Hurricane Township | Fayette County | 3 | 240 |
| Hurst | Williamson County | 1 | 817 |
| Hutsonville | Crawford County | 1 | 702 |
| Hutsonville Township | Crawford County | 5 | 1,151 |
| Hutton Township | Coles County | 4 | 897 |
| Illini Township | Macon County | 2 | 1,475 |
| Illinois City | Rock Island County | 1 | 58 |
| Illiopolis | Sangamon County | 1 | 872 |
| Illiopolis Township | Sangamon County | 3 | 1,354 |
| Ina | Jefferson County | 1 | 2,300 |
| Independence Township | Saline County | 4 | 1,259 |
| Indian Creek | Lake County | 2 | 526 |
| Indian Creek Township | White County | 3 | 2,080 |
| Indian Grove Township | Livingston County | 1 | 4,120 |
| Indian Head Park | Cook County | 3 | 3,807 |
| Indian Point Township | Knox County | 4 | 1,762 |
| Indian Prairie Township | Wayne County | 4 | 637 |
| Indianola | Vermilion County | 1 | 313 |
| Indiantown Township | Bureau County | 3 | 590 |
| Industry | Mcdonough County | 1 | 475 |
| Industry Township | Mcdonough County | 2 | 669 |
| Ingalls Park | Will County | 1 | 3,426 |
| Inverness | Cook County | 2 | 7,457 |
| Iola | Clay County | 1 | 103 |
| Ipava | Fulton County | 1 | 542 |
| Irishtown Township | Clinton County | 3 | 903 |
| Iroquois | Iroquois County | 1 | 173 |
| Iroquois Township | Iroquois County | 3 | 524 |
| Irving | Montgomery County | 1 | 332 |
| Irving Township | Montgomery County | 4 | 659 |
| Irvington | Washington County | 2 | 672 |
| Irvington Township | Washington County | 3 | 1,072 |
| Irwin | Kankakee County | 2 | 88 |
| Isabel Township | Fulton County | 3 | 239 |
| Island Grove Township | Sangamon County | 2 | 555 |
| Island Lake | Lake County | 1 | 8,114 |
| Itasca | DuPage County | 1 | 8,494 |
| Iuka | Marion County | 1 | 512 |
| Iuka Township | Marion County | 2 | 948 |
| Ivesdale | Champaign County | 1 | 254 |
| Jackson Township (Effingham County) | Effingham County | 4 | 1,074 |
| Jackson Township (Will County) | Will County | 4 | 3,934 |
| Jacksonville | Morgan County | 1 | 19,401 |
| Jamaica Township | Vermilion County | 3 | 70 |
| Janesville | Cumberland County | 1 | 38 |
| Jarvis Township | Madison County | 6 | 15,790 |
| Jasper Township | Wayne County | 1 | 1,904 |
| Jefferson Township | Stephenson County | 3 | 128 |
| Jeffersonville | Wayne County | 1 | 492 |
| Jeisyville | Christian County | 2 | 159 |
| Jerome | Sangamon County | 1 | 1,530 |
| Jersey Township | Jersey County | 2 | 9,956 |
| Jerseyville | Jersey County | 1 | 8,833 |
| Jewett | Cumberland County | 1 | 247 |
| Johannisburg Township | Washington County | 5 | 514 |
| Johnsburg | Mchenry County | 2 | 6,325 |
| Johnson Township (Christian County) | Christian County | 3 | 820 |
| Johnson Township (Clark County) | Clark County | 2 | 287 |
| Johnsonville | Wayne County | 1 | 77 |
| Johnston City | Williamson County | 1 | 3,557 |
| Joliet | Will County | 5 | 147,098 |
| Joliet Township | Will County | 5 | 85,782 |
| Jonathan Creek Township | Moultrie County | 3 | 970 |
| Jonesboro | Union County | 1 | 1,895 |
| Joppa | Massac County | 1 | 311 |
| Jordan Township | Whiteside County | 3 | 664 |
| Joshua Township | Fulton County | 3 | 682 |
| Joslin | Rock Island County | 1 | 30 |
| Joy | Mercer County | 1 | 470 |
| Jubilee Township | Peoria County | 2 | 1,565 |
| Junction | Gallatin County | 1 | 152 |
| Junction City | Marion County | 1 | 507 |
| Justice | Cook County | 1 | 12,877 |
| Kampsville | Calhoun County | 1 | 365 |
| Kane | Greene County | 1 | 410 |
| Kane Township | Greene County | 3 | 519 |
| Kaneville | Kane County | 1 | 457 |
| Kaneville Township | Kane County | 4 | 945 |
| Kangley | LaSalle County | 1 | 362 |
| Kankakee | Kankakee County | 1 | 27,560 |
| Kankakee Township | Kankakee County | 1 | 24,896 |
| Kansas | Edgar County | 1 | 832 |
| Kansas Township (Edgar County) | Edgar County | 2 | 1,057 |
| Kansas Township (Woodford County) | Woodford County | 2 | 610 |
| Kappa | Woodford County | 1 | 412 |
| Karnak | Pulaski County | 1 | 637 |
| Kaskaskia | Randolph County | 2 | 4 |
| Kaskaskia Township | Fayette County | 2 | 367 |
| Keene Township | Adams County | 3 | 619 |
| Keenes | Wayne County | 1 | 64 |
| Keensburg | Wabash County | 1 | 172 |
| Keith Township | Wayne County | 3 | 453 |
| Keithsburg | Mercer County | 1 | 544 |
| Keithsburg Township | Mercer County | 3 | 689 |
| Kell | Marion County | 1 | 216 |
| Kelly Township | Warren County | 4 | 491 |
| Kempton | Ford County | 1 | 183 |
| Kendall Township | Kendall County | 3 | 8,591 |
| Kenilworth | Cook County | 1 | 2,669 |
| Kenney | De Witt County | 1 | 353 |
| Kent Township | Stephenson County | 3 | 563 |
| Kerr Township | Champaign County | 5 | 127 |
| Kerton Township | Fulton County | 2 | 55 |
| Kewanee | Henry County | 1 | 12,903 |
| Kewanee Township | Henry County | 1 | 9,819 |
| Keyesport | Bond County | 1 | 478 |
| Kickapoo Township | Peoria County | 5 | 8,202 |
| Kilbourne | Mason County | 1 | 231 |
| Kilbourne Township | Mason County | 5 | 536 |
| Kildeer | Lake County | 3 | 3,952 |
| Kincaid | Christian County | 1 | 1,565 |
| Kinderhook | Pike County | 1 | 197 |
| Kinderhook Township | Pike County | 2 | 760 |
| King Township | Christian County | 3 | 215 |
| Kings | Ogle County | 1 | 348 |
| Kingston | DeKalb County | 1 | 1,071 |
| Kingston (Adams County) | Adams County | 1 | 107 |
| Kingston Mines | Peoria County | 2 | 231 |
| Kingston Township | DeKalb County | 3 | 3,479 |
| Kinkaid Township | Jackson County | 3 | 357 |
| Kinmundy | Marion County | 1 | 803 |
| Kinmundy Township | Marion County | 2 | 1,264 |
| Kinsman | Grundy County | 1 | 127 |
| Kirkland | DeKalb County | 1 | 1,845 |
| Kirkwood | Warren County | 1 | 711 |
| Knight Prairie Township | Hamilton County | 2 | 525 |
| Knollwood | Lake County | 2 | 1,345 |
| Knox Township | Knox County | 4 | 4,909 |
| Knoxville | Knox County | 1 | 2,914 |
| La Clede | Fayette County | 1 | 33 |
| La Clede Township | Fayette County | 2 | 923 |
| La Fayette | Stark County | 1 | 270 |
| La Grange | Cook County | 1 | 15,563 |
| La Grange Park | Cook County | 1 | 13,552 |
| La Harpe | Hancock County | 1 | 1,299 |
| La Harpe Township | Hancock County | 2 | 1,545 |
| La Moille | Bureau County | 1 | 833 |
| La Moille Township | Bureau County | 4 | 1,075 |
| La Prairie | Adams County | 1 | 51 |
| La Prairie Township | Marshall County | 5 | 324 |
| La Rose | Marshall County | 1 | 122 |
| LaPlace | Piatt County | 2 | 152 |
| LaSalle | LaSalle County | 4 | 9,574 |
| LaSalle Township | LaSalle County | 4 | 13,388 |
| Lacon | Marshall County | 1 | 1,958 |
| Lacon Township | Marshall County | 3 | 2,323 |
| Ladd | Bureau County | 1 | 1,388 |
| Laenna Township | Logan County | 4 | 533 |
| Lafayette Township (Coles County) | Coles County | 3 | 4,720 |
| Lafayette Township (Ogle County) | Ogle County | 3 | 137 |
| Lagrange Township | Bond County | 3 | 1,065 |
| Lake Barrington | Lake County | 4 | 4,870 |
| Lake Bluff | Lake County | 1 | 6,214 |
| Lake Camelot | Peoria County | 2 | 1,631 |
| Lake Carroll | Carroll County | 3 | 500 |
| Lake Catherine | Lake County | 1 | 1,253 |
| Lake City | Moultrie County | 1 | 107 |
| Lake Forest | Lake County | 1 | 19,068 |
| Lake Fork Township | Logan County | 3 | 62 |
| Lake Holiday | LaSalle County | 2 | 4,629 |
| Lake Ka-Ho | Macoupin County | 1 | 240 |
| Lake Petersburg | Menard County | 1 | 778 |
| Lake Summerset | Winnebago County | 1 | 1,898 |
| Lake Township | Clinton County | 6 | 898 |
| Lake Villa | Lake County | 1 | 8,827 |
| Lake Villa Township | Lake County | 7 | 39,985 |
| Lake Zurich | Lake County | 1 | 19,679 |
| Lake in the Hills | Mchenry County | 1 | 28,894 |
| Lake of the Woods | Champaign County | 1 | 3,026 |
| Lakemoor | Mchenry County | 3 | 6,415 |
| Lakewood | Mchenry County | 3 | 4,184 |
| Lakewood (Shelby County) | Shelby County | 1 | 32 |
| Lakewood Shores | Will County | 1 | 1,246 |
| Lakewood Township | Shelby County | 2 | 250 |
| Lamard Township | Wayne County | 2 | 1,402 |
| Lamoine Township | Mcdonough County | 2 | 618 |
| Lamotte Township | Crawford County | 2 | 2,128 |
| Lanark | Carroll County | 1 | 1,615 |
| Lancaster Township | Stephenson County | 3 | 1,251 |
| Lane | De Witt County | 1 | 164 |
| Lanesville Township | Sangamon County | 4 | 305 |
| Langleyville | Christian County | 1 | 439 |
| Lansing | Cook County | 1 | 28,270 |
| Laona Township | Winnebago County | 3 | 1,187 |
| Larkinsburg Township | Clay County | 4 | 636 |
| Latham | Logan County | 1 | 303 |
| Lawndale Township | Mclean County | 2 | 40 |
| Lawrence | Mchenry County | 1 | 150 |
| Lawrence Township | Lawrence County | 4 | 6,224 |
| Lawrenceville | Lawrence County | 1 | 4,716 |
| Le Roy | Mclean County | 1 | 3,685 |
| LeRoy Township | Boone County | 3 | 598 |
| Leaf River | Ogle County | 1 | 402 |
| Leaf River Township | Ogle County | 2 | 1,211 |
| Lebanon | Saint Clair County | 1 | 4,020 |
| Lebanon Township | Saint Clair County | 3 | 4,738 |
| Lee | Lee County | 1 | 356 |
| Lee Center | Lee County | 2 | 136 |
| Lee Center Township | Lee County | 4 | 512 |
| Lee Township (Brown County) | Brown County | 3 | 339 |
| Lee Township (Fulton County) | Fulton County | 4 | 236 |
| Leech Township | Wayne County | 3 | 321 |
| Leef Township | Madison County | 4 | 673 |
| Leepertown Township | Bureau County | 7 | 298 |
| Leland | LaSalle County | 1 | 932 |
| Leland Grove | Sangamon County | 1 | 1,740 |
| Lemont | Cook County | 1 | 15,954 |
| Lemont Township | Cook County | 2 | 22,558 |
| Lena | Stephenson County | 1 | 2,847 |
| Lenox Township | Warren County | 3 | 208 |
| Lenzburg | Saint Clair County | 1 | 425 |
| Lenzburg Township | Saint Clair County | 4 | 1,359 |
| Leonore | LaSalle County | 1 | 79 |
| Lerna | Coles County | 1 | 381 |
| Levan Township | Jackson County | 3 | 1,169 |
| Levee Township | Pike County | 1 | 11 |
| Lewistown | Fulton County | 1 | 2,296 |
| Lewistown Township | Fulton County | 2 | 2,671 |
| Lexington | Mclean County | 1 | 2,029 |
| Lexington Township | Mclean County | 4 | 2,586 |
| Leyden Township | Cook County | 14 | 92,993 |
| Liberty | Adams County | 1 | 524 |
| Liberty Township (Adams County) | Adams County | 3 | 1,094 |
| Liberty Township (Effingham County) | Effingham County | 2 | 659 |
| Libertyville | Lake County | 1 | 20,388 |
| Libertyville Township | Lake County | 8 | 54,184 |
| Licking Township | Crawford County | 3 | 492 |
| Lily Lake | Kane County | 3 | 1,024 |
| Lima | Adams County | 3 | 200 |
| Lima Township | Adams County | 5 | 588 |
| Limestone | Kankakee County | 2 | 1,630 |
| Limestone Township (Kankakee County) | Kankakee County | 3 | 4,974 |
| Limestone Township (Peoria County) | Peoria County | 6 | 18,469 |
| Lincoln | Logan County | 1 | 14,259 |
| Lincoln Township | Ogle County | 3 | 592 |
| Lincolnshire | Lake County | 1 | 7,228 |
| Lincolnwood | Cook County | 1 | 12,538 |
| Lindenhurst | Lake County | 2 | 14,415 |
| Linder Township | Greene County | 3 | 252 |
| Linn Township | Woodford County | 5 | 193 |
| Lisbon | Kendall County | 2 | 316 |
| Lisbon Township | Kendall County | 4 | 562 |
| Lisle | DuPage County | 1 | 22,453 |
| Lisle Township | DuPage County | 11 | 119,042 |
| Litchfield | Montgomery County | 1 | 7,086 |
| Literberry | Morgan County | 1 | 78 |
| Little Mackinaw Township | Tazewell County | 3 | 1,500 |
| Little Rock Township | Kendall County | 5 | 14,045 |
| Little York | Warren County | 1 | 271 |
| Littleton | Schuyler County | 1 | 331 |
| Littleton Township | Schuyler County | 1 | 304 |
| Lively Grove Township | Washington County | 3 | 481 |
| Liverpool | Fulton County | 1 | 99 |
| Liverpool Township | Fulton County | 3 | 634 |
| Livingston | Madison County | 1 | 766 |
| Loami | Sangamon County | 1 | 798 |
| Loami Township | Sangamon County | 2 | 1,280 |
| Lockport | Will County | 1 | 24,672 |
| Lockport Heights | Will County | 1 | 885 |
| Lockport Township | Will County | 6 | 59,193 |
| Locust Township | Christian County | 4 | 2,081 |
| Loda | Iroquois County | 1 | 446 |
| Loda Township | Iroquois County | 4 | 1,550 |
| Logan Township | Peoria County | 4 | 3,246 |
| Lomax | Henderson County | 1 | 369 |
| Lomax Township | Henderson County | 2 | 634 |
| Lombard | DuPage County | 1 | 43,180 |
| London Mills | Fulton County | 1 | 432 |
| Lone Grove Township | Fayette County | 2 | 604 |
| Long Branch Township | Saline County | 3 | 347 |
| Long Creek | Macon County | 3 | 1,332 |
| Long Creek Township | Macon County | 5 | 10,455 |
| Long Grove | Lake County | 4 | 8,031 |
| Long Lake | Lake County | 2 | 3,490 |
| Long Point | Livingston County | 1 | 237 |
| Long Point Township | Livingston County | 5 | 446 |
| Longview | Champaign County | 1 | 163 |
| Looking Glass Township | Clinton County | 7 | 6,426 |
| Loraine | Adams County | 1 | 284 |
| Loraine Township | Henry County | 3 | 286 |
| Loran Township | Stephenson County | 3 | 1,508 |
| Lorenzo | Will County | 1 | 31 |
| Lost Nation | Ogle County | 1 | 730 |
| Lostant | LaSalle County | 1 | 383 |
| Loudon Township | Fayette County | 2 | 819 |
| Louisville | Clay County | 1 | 1,177 |
| Louisville Township | Clay County | 1 | 1,863 |
| Love Township | Vermilion County | 2 | 119 |
| Lovejoy Township | Iroquois County | 3 | 543 |
| Loves Park | Winnebago County | 1 | 23,968 |
| Lovington | Moultrie County | 1 | 1,163 |
| Lovington Township | Moultrie County | 3 | 1,576 |
| Lowe Township | Moultrie County | 2 | 1,855 |
| Lowpoint | Woodford County | 1 | 145 |
| Lucas Township | Effingham County | 1 | 407 |
| Ludlow | Champaign County | 1 | 369 |
| Ludlow Township | Champaign County | 3 | 4,201 |
| Lukin Township | Lawrence County | 1 | 633 |
| Lyman Township | Ford County | 2 | 633 |
| Lynchburg Township | Mason County | 4 | 222 |
| Lyndon | Whiteside County | 1 | 657 |
| Lyndon Township | Whiteside County | 5 | 762 |
| Lynn Center | Henry County | 1 | 39 |
| Lynn Township (Henry County) | Henry County | 5 | 731 |
| Lynn Township (Knox County) | Knox County | 4 | 75 |
| Lynnville | Morgan County | 1 | 116 |
| Lynnville Township | Ogle County | 3 | 684 |
| Lynwood | Cook County | 2 | 9,042 |
| Lyons | Cook County | 1 | 10,651 |
| Lyons Township | Cook County | 15 | 114,585 |
| Macedonia | Hamilton County | 1 | 31 |
| Machesney Park | Winnebago County | 1 | 23,231 |
| Mackinaw | Tazewell County | 1 | 2,223 |
| Mackinaw Township | Tazewell County | 4 | 4,314 |
| Macomb | Mcdonough County | 1 | 19,260 |
| Macomb City Township | Mcdonough County | 1 | 15,681 |
| Macomb Township | Mcdonough County | 4 | 630 |
| Macon | Macon County | 1 | 1,221 |
| Macon Township | Bureau County | 3 | 149 |
| Madison | Madison County | 1 | 4,248 |
| Madison Township | Richland County | 3 | 734 |
| Maeystown | Monroe County | 2 | 177 |
| Magnolia | Putnam County | 1 | 289 |
| Magnolia Township | Putnam County | 3 | 817 |
| Mahomet | Champaign County | 1 | 7,230 |
| Mahomet Township | Champaign County | 4 | 13,653 |
| Maine Township (Cook County) | Cook County | 9 | 139,918 |
| Maine Township (Grundy County) | Grundy County | 3 | 234 |
| Makanda | Jackson County | 1 | 495 |
| Makanda Township | Jackson County | 4 | 4,075 |
| Malden | Bureau County | 1 | 467 |
| Malone Township | Tazewell County | 2 | 184 |
| Malta | DeKalb County | 1 | 1,004 |
| Malta Township | DeKalb County | 4 | 1,902 |
| Manchester | Scott County | 2 | 454 |
| Manchester Township | Boone County | 5 | 435 |
| Manhattan | Will County | 1 | 6,456 |
| Manhattan Township | Will County | 4 | 11,545 |
| Manito | Mason County | 1 | 1,934 |
| Manito Township | Mason County | 4 | 2,085 |
| Manlius | Bureau County | 1 | 318 |
| Manlius Township (Bureau County) | Bureau County | 4 | 482 |
| Manlius Township (LaSalle County) | LaSalle County | 3 | 6,144 |
| Mansfield | Piatt County | 1 | 1,059 |
| Manteno | Kankakee County | 1 | 9,253 |
| Manteno Township | Kankakee County | 3 | 11,197 |
| Maple Park | Kane County | 1 | 1,240 |
| Mapleton | Peoria County | 1 | 285 |
| Maquon | Knox County | 1 | 383 |
| Maquon Township | Knox County | 2 | 445 |
| Marcelline | Adams County | 1 | 76 |
| Marengo | Mchenry County | 1 | 7,675 |
| Marengo Township | Mchenry County | 2 | 7,277 |
| Marietta | Fulton County | 1 | 203 |
| Marine | Madison County | 1 | 1,166 |
| Marine Township | Madison County | 4 | 2,377 |
| Marion | Williamson County | 1 | 17,198 |
| Marion Township (Lee County) | Lee County | 3 | 225 |
| Marion Township (Ogle County) | Ogle County | 4 | 3,926 |
| Marissa | Saint Clair County | 1 | 2,362 |
| Marissa Township | Saint Clair County | 2 | 1,643 |
| Mark | Putnam County | 1 | 607 |
| Markham | Cook County | 1 | 12,514 |
| Marley | Will County | 1 | 167 |
| Maroa | Macon County | 1 | 1,960 |
| Maroa Township | Macon County | 2 | 2,286 |
| Marquette Heights | Tazewell County | 2 | 2,836 |
| Marrowbone Township | Moultrie County | 3 | 1,659 |
| Marseilles | LaSalle County | 1 | 5,022 |
| Marshall | Clark County | 1 | 3,983 |
| Marshall Township | Clark County | 1 | 4,561 |
| Martin Township (Crawford County) | Crawford County | 4 | 194 |
| Martin Township (Mclean County) | Mclean County | 3 | 1,226 |
| Martinsburg Township | Pike County | 3 | 362 |
| Martinsville | Clark County | 1 | 1,105 |
| Martinsville Township | Clark County | 1 | 1,714 |
| Martinton | Iroquois County | 1 | 310 |
| Martinton Township | Iroquois County | 5 | 997 |
| Maryland Township | Ogle County | 4 | 330 |
| Maryville | Madison County | 1 | 7,480 |
| Mascoutah | Saint Clair County | 1 | 7,578 |
| Mascoutah Township | Saint Clair County | 5 | 9,288 |
| Mason | Effingham County | 1 | 361 |
| Mason City | Mason County | 1 | 2,313 |
| Mason City Township | Mason County | 4 | 2,509 |
| Mason Township | Effingham County | 2 | 1,501 |
| Massilon Township | Wayne County | 1 | 164 |
| Matherville | Mercer County | 1 | 823 |
| Matteson | Cook County | 1 | 18,692 |
| Mattoon | Coles County | 1 | 18,162 |
| Mattoon Township | Coles County | 3 | 14,681 |
| Maunie | White County | 1 | 144 |
| Maxwell Township | Sangamon County | 3 | 238 |
| May Township (Christian County) | Christian County | 3 | 1,838 |
| May Township (Lee County) | Lee County | 4 | 210 |
| Mayberry Township | Hamilton County | 4 | 574 |
| Mayfield Township | DeKalb County | 5 | 650 |
| Maywood | Cook County | 1 | 24,177 |
| Mazon | Grundy County | 1 | 1,011 |
| Mazon Township | Grundy County | 4 | 1,772 |
| McClellan Township | Jefferson County | 2 | 1,157 |
| McClure | Alexander County | 1 | 416 |
| McCook | Cook County | 2 | 304 |
| McCullom Lake | Mchenry County | 1 | 1,054 |
| McHenry | Mchenry County | 2 | 26,862 |
| McHenry Township | Mchenry County | 9 | 46,562 |
| McKee Township | Adams County | 2 | 108 |
| McKendree Township | Vermilion County | 3 | 681 |
| McLean | Mclean County | 1 | 819 |
| McLeansboro | Hamilton County | 1 | 2,598 |
| McLeansboro Township | Hamilton County | 1 | 3,670 |
| McNabb | Putnam County | 1 | 347 |
| Meacham Township | Marion County | 3 | 167 |
| Mechanicsburg | Sangamon County | 1 | 587 |
| Mechanicsburg Township | Sangamon County | 4 | 2,342 |
| Media | Henderson County | 1 | 110 |
| Media Township | Henderson County | 1 | 390 |
| Medina Township | Peoria County | 5 | 13,892 |
| Medora | Macoupin County | 1 | 369 |
| Melrose Park | Cook County | 2 | 25,241 |
| Melrose Township (Adams County) | Adams County | 5 | 5,729 |
| Melrose Township (Clark County) | Clark County | 4 | 411 |
| Melvin | Ford County | 1 | 599 |
| Mendon | Adams County | 1 | 871 |
| Mendon Township | Adams County | 5 | 1,769 |
| Mendota | LaSalle County | 1 | 7,138 |
| Mendota Township | LaSalle County | 1 | 7,191 |
| Menominee | Jo Daviess County | 1 | 200 |
| Menominee Township | Jo Daviess County | 3 | 761 |
| Mercer Township | Mercer County | 1 | 4,000 |
| Meredosia | Morgan County | 1 | 1,008 |
| Meriden Township | LaSalle County | 2 | 306 |
| Meridian Township | Clinton County | 3 | 555 |
| Merrionette Park | Cook County | 1 | 2,088 |
| Merritt | Scott County | 1 | 26 |
| Metamora | Woodford County | 1 | 3,396 |
| Metamora Township | Woodford County | 4 | 4,524 |
| Metcalf | Edgar County | 1 | 196 |
| Metropolis | Massac County | 1 | 6,537 |
| Mettawa | Lake County | 2 | 502 |
| Meyer | Adams County | 1 | 0 |
| Middlefork Township | Vermilion County | 5 | 1,632 |
| Middleport Township | Iroquois County | 1 | 3,799 |
| Middletown | Logan County | 1 | 284 |
| Midlothian | Cook County | 1 | 14,788 |
| Milan | Rock Island County | 1 | 5,089 |
| Milan Township | DeKalb County | 3 | 178 |
| Milford | Iroquois County | 1 | 1,164 |
| Milford Township | Iroquois County | 1 | 1,632 |
| Milks Grove Township | Iroquois County | 3 | 247 |
| Mill Creek | Union County | 1 | 80 |
| Mill Shoals | White County | 1 | 217 |
| Mill Shoals Township | White County | 5 | 535 |
| Millbrook | Kendall County | 1 | 271 |
| Millbrook Township | Peoria County | 5 | 357 |
| Milledgeville | Carroll County | 1 | 1,191 |
| Miller Township | LaSalle County | 3 | 577 |
| Millersburg | Mercer County | 2 | 76 |
| Millersburg Township | Mercer County | 3 | 542 |
| Millington | Kendall County | 1 | 768 |
| Mills Township | Bond County | 2 | 394 |
| Millstadt | Saint Clair County | 1 | 3,946 |
| Millstadt Township | Saint Clair County | 7 | 6,750 |
| Milo Township | Bureau County | 1 | 265 |
| Milton | Pike County | 1 | 425 |
| Milton Township | DuPage County | 12 | 120,022 |
| Mineral | Bureau County | 1 | 296 |
| Mineral Township | Bureau County | 3 | 468 |
| Minier | Tazewell County | 1 | 1,098 |
| Minonk | Woodford County | 1 | 2,229 |
| Minonk Township | Woodford County | 3 | 2,198 |
| Minooka | Grundy County | 1 | 10,548 |
| Mission Township | LaSalle County | 6 | 4,254 |
| Mississippi Township | Jersey County | 3 | 1,742 |
| Missouri Township | Brown County | 2 | 190 |
| Mitchell | Madison County | 1 | 1,321 |
| Moccasin Township | Effingham County | 2 | 306 |
| Modesto | Macoupin County | 1 | 264 |
| Mokena | Will County | 1 | 18,424 |
| Moline | Rock Island County | 1 | 43,390 |
| Moline Township | Rock Island County | 3 | 22,911 |
| Momence | Kankakee County | 1 | 3,459 |
| Momence Township | Kankakee County | 2 | 3,610 |
| Mona Township | Ford County | 3 | 360 |
| Monee | Will County | 1 | 5,099 |
| Monee Township | Will County | 5 | 15,579 |
| Money Creek Township | Mclean County | 3 | 963 |
| Monmouth | Warren County | 1 | 9,659 |
| Monmouth Township | Warren County | 1 | 10,001 |
| Monroe Center | Ogle County | 1 | 469 |
| Monroe Township | Ogle County | 5 | 1,248 |
| Montebello Township | Hancock County | 4 | 3,361 |
| Montezuma Township | Pike County | 3 | 478 |
| Montgomery | Kane County | 1 | 18,123 |
| Montgomery Township (Crawford County) | Crawford County | 5 | 532 |
| Montgomery Township (Woodford County) | Woodford County | 5 | 2,435 |
| Monticello | Piatt County | 1 | 5,297 |
| Monticello Township | Piatt County | 4 | 6,048 |
| Montmorency Township | Whiteside County | 1 | 2,480 |
| Montrose | Effingham County | 1 | 209 |
| Moores Prairie Township | Jefferson County | 2 | 337 |
| Moraine Township | Lake County | 5 | 34,128 |
| Morgan Township | Coles County | 3 | 278 |
| Moro | Madison County | 1 | 362 |
| Moro Township | Madison County | 6 | 3,523 |
| Morris | Grundy County | 1 | 13,896 |
| Morris Township | Grundy County | 1 | 7,135 |
| Morrison | Whiteside County | 1 | 4,052 |
| Morrisonville | Christian County | 1 | 986 |
| Morton | Tazewell County | 1 | 16,255 |
| Morton Grove | Cook County | 1 | 23,194 |
| Morton Township | Tazewell County | 5 | 17,737 |
| Mosquito Township | Christian County | 4 | 189 |
| Mossville | Peoria County | 1 | 263 |
| Mound City | Pulaski County | 1 | 791 |
| Mound Station | Brown County | 1 | 95 |
| Mound Township (Effingham County) | Effingham County | 1 | 3,557 |
| Mound Township (Mcdonough County) | Mcdonough County | 5 | 174 |
| Mounds | Pulaski County | 1 | 984 |
| Mount Auburn | Christian County | 1 | 458 |
| Mount Auburn Township | Christian County | 6 | 975 |
| Mount Carmel | Wabash County | 1 | 7,276 |
| Mount Carroll | Carroll County | 1 | 1,944 |
| Mount Carroll Township | Carroll County | 2 | 2,152 |
| Mount Clare | Macoupin County | 2 | 313 |
| Mount Erie | Wayne County | 1 | 128 |
| Mount Erie Township | Wayne County | 2 | 389 |
| Mount Hope Township | Mclean County | 3 | 1,029 |
| Mount Morris | Ogle County | 1 | 3,060 |
| Mount Morris Township | Ogle County | 4 | 3,727 |
| Mount Olive | Macoupin County | 1 | 2,150 |
| Mount Olive Township | Macoupin County | 4 | 3,135 |
| Mount Pleasant Township | Whiteside County | 3 | 4,797 |
| Mount Prospect | Cook County | 1 | 54,144 |
| Mount Pulaski | Logan County | 1 | 1,253 |
| Mount Pulaski Township | Logan County | 2 | 2,203 |
| Mount Sterling | Brown County | 1 | 2,369 |
| Mount Sterling Township | Brown County | 1 | 4,287 |
| Mount Vernon | Jefferson County | 1 | 15,051 |
| Mount Vernon Township | Jefferson County | 2 | 12,606 |
| Mount Zion | Macon County | 3 | 5,703 |
| Mount Zion Township | Macon County | 5 | 7,146 |
| Mountain Township | Saline County | 3 | 386 |
| Moweaqua | Shelby County | 1 | 1,848 |
| Moweaqua Township | Shelby County | 1 | 2,082 |
| Muddy | Saline County | 2 | 37 |
| Mulberry Grove | Bond County | 1 | 788 |
| Mulberry Grove Township | Bond County | 5 | 1,263 |
| Mulkeytown | Franklin County | 1 | 101 |
| Muncie | Vermilion County | 1 | 90 |
| Mundelein | Lake County | 1 | 31,506 |
| Munson Township | Henry County | 3 | 351 |
| Murdock Township | Douglas County | 5 | 302 |
| Murphysboro | Jackson County | 1 | 8,166 |
| Murphysboro Township | Jackson County | 3 | 9,527 |
| Murrayville | Morgan County | 1 | 596 |
| Na-Au-Say Township | Kendall County | 7 | 10,524 |
| Nachusa | Lee County | 1 | 122 |
| Nachusa Township | Lee County | 3 | 445 |
| Nameoki Township | Madison County | 4 | 12,189 |
| Naperville | Will County | 4 | 142,143 |
| Naperville Township | DuPage County | 8 | 104,615 |
| Naplate | LaSalle County | 1 | 491 |
| Naples | Scott County | 1 | 49 |
| Nashville | Washington County | 1 | 3,379 |
| Nashville Township | Washington County | 1 | 3,491 |
| Nason | Jefferson County | 1 | 191 |
| Nauvoo | Hancock County | 1 | 1,189 |
| Nauvoo Township | Hancock County | 1 | 854 |
| Nebo | Pike County | 1 | 497 |
| Nebraska Township | Livingston County | 1 | 1,260 |
| Nekoma | Henry County | 1 | 48 |
| Nelson | Lee County | 1 | 282 |
| Nelson Township | Lee County | 3 | 536 |
| Neoga | Cumberland County | 1 | 1,845 |
| Neoga Township | Cumberland County | 5 | 2,827 |
| Neponset | Bureau County | 1 | 480 |
| Neponset Township | Bureau County | 2 | 638 |
| Nettle Creek Township | Grundy County | 3 | 706 |
| Nevada Township | Livingston County | 3 | 132 |
| New Athens | Saint Clair County | 1 | 2,170 |
| New Athens Township | Saint Clair County | 3 | 2,721 |
| New Baden | Clinton County | 1 | 3,205 |
| New Bedford | Bureau County | 1 | 73 |
| New Berlin | Sangamon County | 1 | 1,281 |
| New Berlin Township | Sangamon County | 2 | 1,433 |
| New Boston | Mercer County | 1 | 843 |
| New Boston Township | Mercer County | 2 | 886 |
| New Burnside | Johnson County | 1 | 147 |
| New Canton | Pike County | 1 | 364 |
| New Douglas | Madison County | 1 | 377 |
| New Douglas Township | Madison County | 3 | 411 |
| New Grand Chain | Pulaski County | 1 | 227 |
| New Haven | Gallatin County | 1 | 443 |
| New Haven Township | Gallatin County | 5 | 439 |
| New Holland | Logan County | 1 | 199 |
| New Lenox | Will County | 1 | 24,369 |
| New Lenox Township | Will County | 6 | 43,490 |
| New Milford | Winnebago County | 2 | 790 |
| New Minden | Washington County | 2 | 167 |
| New Salem | Pike County | 1 | 142 |
| New Salem Township (Mcdonough County) | Mcdonough County | 3 | 314 |
| New Salem Township (Pike County) | Pike County | 4 | 549 |
| New Trier Township | Cook County | 7 | 57,020 |
| Newark | Kendall County | 1 | 932 |
| Newburg Township | Pike County | 2 | 785 |
| Newcomb Township | Champaign County | 3 | 1,230 |
| Newell Township | Vermilion County | 3 | 13,846 |
| Newman | Douglas County | 1 | 850 |
| Newman Township | Douglas County | 1 | 929 |
| Newmansville Township | Cass County | 4 | 61 |
| Newport Township | Lake County | 4 | 6,849 |
| Newton | Jasper County | 1 | 2,835 |
| Newton Township | Whiteside County | 4 | 357 |
| Newtown Township | Livingston County | 4 | 775 |
| Niantic | Macon County | 1 | 758 |
| Niantic Township | Macon County | 3 | 854 |
| Niles | Cook County | 1 | 29,720 |
| Niles Township | Cook County | 12 | 111,630 |
| Nilwood | Macoupin County | 1 | 211 |
| Nilwood Township | Macoupin County | 3 | 545 |
| Niota | Hancock County | 1 | 85 |
| Nixon Township | De Witt County | 1 | 495 |
| Noble | Richland County | 1 | 623 |
| Noble Township | Richland County | 3 | 1,402 |
| Nokomis | Montgomery County | 1 | 2,347 |
| Nokomis Township | Montgomery County | 2 | 2,795 |
| Nora | Jo Daviess County | 1 | 87 |
| Nora Township | Jo Daviess County | 4 | 403 |
| Normal | Mclean County | 2 | 52,986 |
| Normal Township | Mclean County | 7 | 53,062 |
| Norman Township | Grundy County | 3 | 431 |
| Norridge | Cook County | 2 | 14,656 |
| Norris | Fulton County | 1 | 260 |
| Norris City | White County | 1 | 1,272 |
| North Aurora | Kane County | 1 | 16,231 |
| North Barrington | Lake County | 3 | 3,313 |
| North Chicago | Lake County | 1 | 31,677 |
| North City | Franklin County | 3 | 770 |
| North Fork Township | Gallatin County | 4 | 260 |
| North Henderson | Mercer County | 1 | 209 |
| North Henderson Township | Mercer County | 4 | 373 |
| North Litchfield Township | Montgomery County | 2 | 4,957 |
| North Muddy Township | Jasper County | 2 | 553 |
| North Okaw Township | Coles County | 5 | 1,474 |
| North Otter Township | Macoupin County | 2 | 583 |
| North Palmyra Township | Macoupin County | 2 | 894 |
| North Pekin | Tazewell County | 2 | 1,643 |
| North Riverside | Cook County | 5 | 6,920 |
| North Utica | LaSalle County | 4 | 1,186 |
| Northbrook | Cook County | 1 | 33,095 |
| Northeast Township | Adams County | 4 | 987 |
| Northern Township | Franklin County | 2 | 392 |
| Northfield | Cook County | 4 | 5,234 |
| Northfield Township | Cook County | 11 | 90,794 |
| Northlake | Cook County | 5 | 12,287 |
| Northville Township | LaSalle County | 6 | 7,330 |
| Norton Township | Kankakee County | 4 | 1,108 |
| Norwood | Peoria County | 1 | 407 |
| Norwood Park Township | Cook County | 4 | 27,276 |
| Nunda Township | Mchenry County | 8 | 38,402 |
| O'Fallon | Saint Clair County | 5 | 28,377 |
| O'Fallon Township | Saint Clair County | 4 | 26,403 |
| Oak Brook | DuPage County | 1 | 7,905 |
| Oak Forest | Cook County | 1 | 27,922 |
| Oak Grove | Rock Island County | 1 | 635 |
| Oak Lawn | Cook County | 1 | 56,524 |
| Oak Park | Cook County | 3 | 51,781 |
| Oak Park Township | Cook County | 3 | 54,100 |
| Oak Run | Knox County | 1 | 417 |
| Oakbrook Terrace | DuPage County | 3 | 2,205 |
| Oakdale | Washington County | 1 | 272 |
| Oakdale Township | Washington County | 3 | 722 |
| Oakford | Menard County | 1 | 312 |
| Oakland | Coles County | 1 | 704 |
| Oakland Township | Schuyler County | 1 | 191 |
| Oakley Township | Macon County | 4 | 582 |
| Oakwood | Vermilion County | 1 | 1,668 |
| Oakwood Hills | Mchenry County | 2 | 2,266 |
| Oakwood Township | Vermilion County | 5 | 3,211 |
| Oblong | Crawford County | 1 | 1,484 |
| Oblong Township | Crawford County | 3 | 2,764 |
| Oconee | Shelby County | 1 | 172 |
| Oconee Township | Shelby County | 2 | 822 |
| Odell | Livingston County | 1 | 1,072 |
| Odell Township | Livingston County | 2 | 1,060 |
| Odin | Marion County | 1 | 1,114 |
| Odin Township | Marion County | 2 | 1,571 |
| Ogden | Champaign County | 1 | 734 |
| Ogden Township | Champaign County | 5 | 1,797 |
| Oglesby | LaSalle County | 1 | 3,645 |
| Ohio | Bureau County | 1 | 483 |
| Ohio Grove Township | Mercer County | 3 | 342 |
| Ohio Township | Bureau County | 2 | 880 |
| Ohlman | Montgomery County | 1 | 97 |
| Okaw Township | Shelby County | 3 | 908 |
| Okawville | Washington County | 1 | 1,387 |
| Okawville Township | Washington County | 5 | 2,040 |
| Old Mill Creek | Lake County | 4 | 144 |
| Old Ripley | Bond County | 1 | 105 |
| Old Ripley Township | Bond County | 4 | 1,238 |
| Old Shawneetown | Gallatin County | 1 | 200 |
| Old Town Township | Mclean County | 4 | 3,360 |
| Olio Township | Woodford County | 3 | 4,749 |
| Olive Branch | Alexander County | 1 | 802 |
| Olive Township | Madison County | 5 | 1,569 |
| Olivet | Vermilion County | 2 | 383 |
| Olmsted | Pulaski County | 1 | 433 |
| Olney | Richland County | 1 | 9,032 |
| Olney Township | Richland County | 1 | 10,037 |
| Olympia Fields | Cook County | 1 | 4,823 |
| Omaha | Gallatin County | 1 | 242 |
| Omaha Township | Gallatin County | 3 | 654 |
| Omega Township | Marion County | 3 | 237 |
| Omphghent Township | Madison County | 3 | 2,653 |
| Onarga | Iroquois County | 1 | 1,378 |
| Onarga Township | Iroquois County | 3 | 1,522 |
| Oneco Township | Stephenson County | 4 | 1,222 |
| Oneida | Knox County | 1 | 782 |
| Ontario Township | Knox County | 2 | 1,057 |
| Opdyke | Jefferson County | 1 | 357 |
| Ophiem | Henry County | 1 | 180 |
| Ophir Township | LaSalle County | 5 | 354 |
| Oquawka | Henderson County | 1 | 1,201 |
| Oquawka Township | Henderson County | 1 | 2,139 |
| Ora Township | Jackson County | 4 | 620 |
| Oran Township | Logan County | 4 | 387 |
| Orange Township (Clark County) | Clark County | 4 | 161 |
| Orange Township (Knox County) | Knox County | 4 | 551 |
| Orangeville | Stephenson County | 1 | 881 |
| Orchard Township | Wayne County | 3 | 973 |
| Oreana | Macon County | 1 | 1,080 |
| Oregon | Ogle County | 1 | 3,671 |
| Oregon-Nashua Township | Ogle County | 3 | 4,800 |
| Orel Township | Wayne County | 4 | 1,329 |
| Orient | Franklin County | 1 | 341 |
| Orion | Henry County | 1 | 1,934 |
| Orion Township | Fulton County | 3 | 820 |
| Orland Hills | Cook County | 3 | 7,118 |
| Orland Park | Cook County | 2 | 56,607 |
| Orland Township | Cook County | 6 | 98,063 |
| Orvil Township | Logan County | 4 | 1,161 |
| Osage Township | LaSalle County | 3 | 304 |
| Osceola Township | Stark County | 3 | 861 |
| Osco | Henry County | 1 | 110 |
| Osco Township | Henry County | 3 | 278 |
| Oskaloosa Township | Clay County | 3 | 524 |
| Oswego | Kendall County | 1 | 30,302 |
| Oswego Township | Kendall County | 6 | 55,542 |
| Otego Township | Fayette County | 2 | 1,549 |
| Ottawa | LaSalle County | 1 | 19,258 |
| Ottawa Township | LaSalle County | 1 | 11,279 |
| Otter Creek Township (Jersey County) | Jersey County | 3 | 881 |
| Otter Creek Township (LaSalle County) | LaSalle County | 1 | 2,694 |
| Otterville | Jersey County | 1 | 94 |
| Otto Township | Kankakee County | 5 | 2,319 |
| Owaneco | Christian County | 1 | 157 |
| Owego Township | Livingston County | 2 | 238 |
| Owen Township | Winnebago County | 6 | 3,626 |
| Oxford Township | Henry County | 5 | 1,208 |
| Oxville | Scott County | 1 | 18 |
| Paderborn | Saint Clair County | 1 | 40 |
| Palatine | Cook County | 2 | 68,338 |
| Palatine Township | Cook County | 9 | 114,026 |
| Palestine | Crawford County | 1 | 1,526 |
| Palestine Township | Woodford County | 6 | 1,059 |
| Palmer | Christian County | 1 | 226 |
| Palmyra | Macoupin County | 1 | 689 |
| Palmyra Township | Lee County | 2 | 2,874 |
| Paloma | Adams County | 1 | 174 |
| Palos Heights | Cook County | 1 | 12,446 |
| Palos Hills | Cook County | 1 | 17,458 |
| Palos Park | Cook County | 1 | 4,805 |
| Palos Township | Cook County | 10 | 56,516 |
| Pana | Christian County | 1 | 5,850 |
| Pana Township | Christian County | 1 | 6,222 |
| Panama | Montgomery County | 1 | 180 |
| Panola | Woodford County | 1 | 51 |
| Panola Township | Woodford County | 3 | 319 |
| Panther Creek Township | Cass County | 2 | 189 |
| Papineau | Iroquois County | 1 | 232 |
| Papineau Township | Iroquois County | 3 | 312 |
| Paradise Township | Coles County | 3 | 1,040 |
| Paris | Edgar County | 1 | 8,896 |
| Paris Township | Edgar County | 1 | 9,260 |
| Park City | Lake County | 2 | 7,383 |
| Park Forest | Cook County | 1 | 22,424 |
| Park Ridge | Cook County | 1 | 37,266 |
| Parker Township | Clark County | 3 | 370 |
| Parkersburg | Richland County | 1 | 249 |
| Partridge Township | Woodford County | 4 | 522 |
| Patoka | Marion County | 1 | 642 |
| Patoka Township | Marion County | 3 | 1,082 |
| Patterson Township | Greene County | 4 | 522 |
| Patton Township | Ford County | 2 | 5,264 |
| Paw Paw | Lee County | 1 | 962 |
| Paw Paw Township | DeKalb County | 3 | 304 |
| Pawnee | Sangamon County | 1 | 2,680 |
| Pawnee Township | Sangamon County | 2 | 2,996 |
| Paxton | Ford County | 1 | 4,393 |
| Payson | Adams County | 1 | 1,213 |
| Payson Township | Adams County | 5 | 2,309 |
| Pea Ridge Township | Brown County | 1 | 20 |
| Peach Orchard Township | Ford County | 1 | 617 |
| Pearl | Pike County | 1 | 178 |
| Pearl City | Stephenson County | 1 | 878 |
| Pearl Township | Pike County | 2 | 122 |
| Pecatonica | Winnebago County | 1 | 2,238 |
| Pecatonica Township | Winnebago County | 3 | 4,127 |
| Pekin | Tazewell County | 1 | 33,700 |
| Pekin Township | Tazewell County | 4 | 27,832 |
| Pella Township | Ford County | 2 | 183 |
| Pembroke Township | Kankakee County | 1 | 1,410 |
| Pendleton Township | Jefferson County | 3 | 1,402 |
| Penfield | Champaign County | 1 | 156 |
| Penn Township (Shelby County) | Shelby County | 1 | 16 |
| Penn Township (Stark County) | Stark County | 2 | 255 |
| Pennsylvania Township | Mason County | 4 | 183 |
| Peoria | Peoria County | 9 | 114,754 |
| Peoria City Township | Peoria County | 14 | 98,659 |
| Peoria Heights | Peoria County | 1 | 6,216 |
| Peotone | Will County | 1 | 4,703 |
| Peotone Township | Will County | 2 | 4,388 |
| Percy | Randolph County | 1 | 861 |
| Perry | Pike County | 1 | 409 |
| Perry Township | Pike County | 4 | 462 |
| Perryton Township | Mercer County | 2 | 404 |
| Persifer Township | Knox County | 4 | 1,001 |
| Peru | LaSalle County | 1 | 10,189 |
| Peru Township | LaSalle County | 3 | 10,217 |
| Pesotum | Champaign County | 1 | 516 |
| Pesotum Township | Champaign County | 3 | 783 |
| Petersburg | Menard County | 1 | 2,234 |
| Petty Township | Lawrence County | 3 | 688 |
| Phenix Township | Henry County | 2 | 1,690 |
| Philadelphia Township | Cass County | 2 | 136 |
| Phillips Township | White County | 4 | 1,172 |
| Phillipstown | White County | 1 | 69 |
| Philo | Champaign County | 1 | 1,569 |
| Philo Township | Champaign County | 5 | 2,130 |
| Phoenix | Cook County | 1 | 1,889 |
| Piasa Township | Jersey County | 3 | 3,167 |
| Pickaway Township | Shelby County | 2 | 348 |
| Pierce Township | DeKalb County | 4 | 450 |
| Pierron | Bond County | 2 | 488 |
| Pigeon Grove Township | Iroquois County | 4 | 1,155 |
| Pike Township | Livingston County | 4 | 525 |
| Pilot Grove Township | Hancock County | 3 | 173 |
| Pilot Knob Township | Washington County | 2 | 430 |
| Pilot Township (Kankakee County) | Kankakee County | 3 | 1,973 |
| Pilot Township (Vermilion County) | Vermilion County | 6 | 488 |
| Pin Oak Township | Madison County | 6 | 4,475 |
| Pinckneyville | Perry County | 1 | 5,631 |
| Pine Creek Township | Ogle County | 4 | 732 |
| Pine Rock Township | Ogle County | 3 | 1,084 |
| Pingree Grove | Kane County | 1 | 4,425 |
| Piper City | Ford County | 1 | 754 |
| Pistakee Highlands | Mchenry County | 4 | 3,154 |
| Pitman Township | Montgomery County | 3 | 389 |
| Pittsburg | Williamson County | 1 | 730 |
| Pittsfield | Pike County | 1 | 4,754 |
| Pittsfield Township | Pike County | 1 | 4,108 |
| Pixley Township | Clay County | 4 | 460 |
| Plainfield | Will County | 3 | 39,030 |
| Plainfield Township | Will County | 8 | 82,331 |
| Plainville | Adams County | 1 | 350 |
| Plano | Kendall County | 1 | 10,602 |
| Plato Township | Kane County | 4 | 8,922 |
| Plattville | Kendall County | 2 | 233 |
| Pleasant Grove Township | Coles County | 4 | 875 |
| Pleasant Hill | Pike County | 1 | 1,327 |
| Pleasant Hill Township | Pike County | 2 | 1,313 |
| Pleasant Mound Township | Bond County | 3 | 1,172 |
| Pleasant Plains | Sangamon County | 1 | 883 |
| Pleasant Ridge Township | Livingston County | 3 | 261 |
| Pleasant Township | Fulton County | 2 | 905 |
| Pleasant Vale Township | Pike County | 3 | 461 |
| Pleasant Valley Township | Jo Daviess County | 3 | 276 |
| Pleasant View Township | Macon County | 3 | 1,293 |
| Plum Hill Township | Washington County | 4 | 487 |
| Plum Valley | Will County | 1 | 379 |
| Plymouth | Hancock County | 1 | 458 |
| Pocahontas | Bond County | 1 | 732 |
| Point Pleasant Township | Warren County | 4 | 68 |
| Polk Township | Macoupin County | 2 | 519 |
| Polo | Ogle County | 1 | 2,410 |
| Pomona Township | Jackson County | 7 | 668 |
| Pontiac | Livingston County | 1 | 12,210 |
| Pontiac Township | Livingston County | 1 | 12,553 |
| Pontoon Beach | Madison County | 3 | 5,790 |
| Pontoosuc | Hancock County | 2 | 103 |
| Pontoosuc Township | Hancock County | 2 | 307 |
| Pope Township | Fayette County | 2 | 176 |
| Poplar Grove | Boone County | 1 | 5,879 |
| Poplar Grove Township | Boone County | 4 | 5,126 |
| Port Barrington | Mchenry County | 4 | 1,610 |
| Port Byron | Rock Island County | 1 | 1,720 |
| Port Byron Township | Rock Island County | 3 | 1,455 |
| Portland Township | Whiteside County | 2 | 324 |
| Posen | Cook County | 1 | 5,975 |
| Potomac | Vermilion County | 1 | 900 |
| Prairie City | Mcdonough County | 1 | 542 |
| Prairie City Township | Mcdonough County | 1 | 456 |
| Prairie Creek Township | Logan County | 4 | 307 |
| Prairie Du Long Township | Saint Clair County | 4 | 2,599 |
| Prairie Green Township | Iroquois County | 3 | 30 |
| Prairie Grove | Mchenry County | 3 | 1,787 |
| Prairie Township (Crawford County) | Crawford County | 4 | 343 |
| Prairie Township (Edgar County) | Edgar County | 2 | 205 |
| Prairie Township (Hancock County) | Hancock County | 4 | 365 |
| Prairie Township (Shelby County) | Shelby County | 1 | 1,038 |
| Prairie du Rocher | Randolph County | 1 | 512 |
| Prairieton Township | Christian County | 3 | 565 |
| Prairietown | Madison County | 2 | 298 |
| Preemption | Mercer County | 3 | 172 |
| Preemption Township | Mercer County | 6 | 2,001 |
| Prestbury | Kane County | 2 | 1,822 |
| Preston Heights | Will County | 2 | 2,777 |
| Preston Township | Richland County | 3 | 1,382 |
| Princeton | Bureau County | 1 | 7,831 |
| Princeton Township | Bureau County | 2 | 9,186 |
| Princeville | Peoria County | 1 | 2,096 |
| Princeville Township | Peoria County | 2 | 1,995 |
| Prophetstown | Whiteside County | 1 | 2,133 |
| Prophetstown Township | Whiteside County | 2 | 2,460 |
| Prospect Heights | Cook County | 1 | 16,228 |
| Proviso Township | Cook County | 19 | 151,069 |
| Pulaski | Pulaski County | 1 | 224 |
| Putman Township | Fulton County | 3 | 1,683 |
| Quarry Township | Jersey County | 3 | 893 |
| Quincy | Adams County | 2 | 40,647 |
| Quincy Township | Adams County | 2 | 39,687 |
| Quiver Township | Mason County | 3 | 754 |
| Raccoon Township | Marion County | 6 | 1,320 |
| Radnor Township | Peoria County | 5 | 5,058 |
| Radom | Washington County | 1 | 211 |
| Raleigh | Saline County | 1 | 315 |
| Raleigh Township | Saline County | 4 | 995 |
| Ramsey | Fayette County | 1 | 1,111 |
| Ramsey Township | Fayette County | 2 | 1,793 |
| Randolph Township | Mclean County | 4 | 4,253 |
| Rankin | Vermilion County | 1 | 501 |
| Ransom | LaSalle County | 1 | 374 |
| Rantoul | Champaign County | 1 | 12,880 |
| Rantoul Township | Champaign County | 3 | 10,658 |
| Rapids City | Rock Island County | 1 | 856 |
| Raritan | Henderson County | 1 | 125 |
| Raritan Township | Henderson County | 2 | 166 |
| Rawlins Township | Jo Daviess County | 1 | 497 |
| Raymond | Montgomery County | 1 | 905 |
| Raymond Township (Champaign County) | Champaign County | 4 | 262 |
| Raymond Township (Montgomery County) | Montgomery County | 2 | 1,081 |
| Reading Township | Livingston County | 2 | 1,855 |
| Rector Township | Saline County | 2 | 16 |
| Red Bud | Randolph County | 1 | 3,670 |
| Reddick | Kankakee County | 1 | 293 |
| Redmon | Edgar County | 1 | 194 |
| Reed Township | Will County | 4 | 6,902 |
| Rentchler | Saint Clair County | 1 | 0 |
| Rest Haven | Will County | 1 | 550 |
| Reynolds | Rock Island County | 1 | 573 |
| Reynolds Township | Lee County | 4 | 263 |
| Rice Township | Jo Daviess County | 2 | 637 |
| Rich Township | Cook County | 12 | 76,105 |
| Richfield | Adams County | 2 | 0 |
| Richfield Township | Adams County | 3 | 84 |
| Richland Grove Township | Mercer County | 6 | 1,984 |
| Richland Township (LaSalle County) | LaSalle County | 4 | 319 |
| Richland Township (Marshall County) | Marshall County | 3 | 383 |
| Richland Township (Shelby County) | Shelby County | 2 | 779 |
| Richmond | Mchenry County | 1 | 2,092 |
| Richmond Township | Mchenry County | 6 | 6,759 |
| Richton Park | Cook County | 1 | 13,568 |
| Richview | Washington County | 1 | 205 |
| Richview Township | Washington County | 2 | 333 |
| Richwood Township | Jersey County | 2 | 423 |
| Richwoods Township | Peoria County | 3 | 5,940 |
| Ricks Township | Christian County | 2 | 1,250 |
| Ridge Farm | Vermilion County | 1 | 936 |
| Ridge Township | Shelby County | 1 | 301 |
| Ridgefield | Mchenry County | 2 | 274 |
| Ridgeland Township | Iroquois County | 4 | 419 |
| Ridgewood | Will County | 1 | 3,089 |
| Ridgway | Gallatin County | 1 | 817 |
| Ridgway Township | Gallatin County | 3 | 862 |
| Ridott | Stephenson County | 1 | 134 |
| Ridott Township | Stephenson County | 4 | 1,511 |
| Riggston | Scott County | 1 | 15 |
| Riley | Mchenry County | 1 | 0 |
| Riley Township | Mchenry County | 3 | 2,998 |
| Ringwood | Mchenry County | 1 | 833 |
| Rio | Knox County | 1 | 210 |
| Rio Township | Knox County | 3 | 389 |
| Ripley | Brown County | 1 | 59 |
| Ripley Township | Brown County | 1 | 48 |
| Ritchie | Will County | 1 | 164 |
| River Forest | Cook County | 1 | 11,174 |
| River Forest Township | Cook County | 4 | 11,742 |
| River Grove | Cook County | 1 | 10,224 |
| Riverdale | Cook County | 1 | 13,552 |
| Riverside | Cook County | 1 | 8,859 |
| Riverside Township (Adams County) | Adams County | 3 | 1,730 |
| Riverside Township (Cook County) | Cook County | 3 | 16,509 |
| Riverton | Sangamon County | 1 | 3,451 |
| Riverwoods | Lake County | 2 | 3,854 |
| Rivoli Township | Mercer County | 2 | 1,129 |
| Roanoke | Woodford County | 1 | 2,025 |
| Roanoke Township | Woodford County | 3 | 2,063 |
| Robbins | Cook County | 1 | 5,132 |
| Roberts | Ford County | 1 | 314 |
| Roberts Township | Marshall County | 3 | 809 |
| Robinson | Crawford County | 1 | 7,656 |
| Robinson Township | Crawford County | 1 | 9,396 |
| Rochelle | Ogle County | 1 | 9,578 |
| Rochester | Sangamon County | 1 | 3,712 |
| Rochester Township | Sangamon County | 3 | 5,509 |
| Rock City | Stephenson County | 1 | 316 |
| Rock Creek Township | Hancock County | 4 | 319 |
| Rock Creek-Lima Township | Carroll County | 5 | 1,940 |
| Rock Falls | Whiteside County | 1 | 9,075 |
| Rock Grove Township | Stephenson County | 3 | 1,626 |
| Rock Island | Rock Island County | 1 | 38,808 |
| Rock Island Arsenal | Rock Island County | 2 | 130 |
| Rock Island Township | Rock Island County | 2 | 16,264 |
| Rock Run Township | Stephenson County | 6 | 2,098 |
| Rockbridge | Greene County | 1 | 214 |
| Rockbridge Township | Greene County | 3 | 1,894 |
| Rockdale | Will County | 1 | 1,909 |
| Rockford | Winnebago County | 8 | 152,948 |
| Rockford Township | Winnebago County | 16 | 171,006 |
| Rockport | Pike County | 1 | 49 |
| Rockton | Winnebago County | 1 | 7,370 |
| Rockton Township | Winnebago County | 3 | 16,101 |
| Rockvale Township | Ogle County | 4 | 1,497 |
| Rockville Township | Kankakee County | 2 | 718 |
| Rockwood | Randolph County | 1 | 83 |
| Rocky Run-Wilcox Township | Hancock County | 4 | 153 |
| Rogers Township | Ford County | 2 | 416 |
| Rolling Meadows | Cook County | 1 | 23,645 |
| Rome | Peoria County | 1 | 1,614 |
| Rome Township | Jefferson County | 4 | 1,480 |
| Romeoville | Will County | 1 | 39,175 |
| Romine Township | Marion County | 4 | 578 |
| Roodhouse | Greene County | 1 | 1,833 |
| Roodhouse Township | Greene County | 1 | 1,784 |
| Rooks Creek Township | Livingston County | 3 | 502 |
| Rosamond Township | Christian County | 4 | 218 |
| Roscoe | Winnebago County | 1 | 10,679 |
| Roscoe Township | Winnebago County | 5 | 20,061 |
| Rose Hill | Jasper County | 1 | 91 |
| Rose Township | Shelby County | 3 | 1,952 |
| Rosedale Township | Jersey County | 3 | 394 |
| Rosefield Township | Peoria County | 5 | 956 |
| Roselle | DuPage County | 1 | 22,814 |
| Rosemont | Cook County | 5 | 3,499 |
| Roseville | Warren County | 1 | 1,045 |
| Roseville Township | Warren County | 3 | 914 |
| Rosewood Heights | Madison County | 4 | 4,058 |
| Rosiclare | Hardin County | 1 | 1,102 |
| Ross Township (Edgar County) | Edgar County | 4 | 1,729 |
| Ross Township (Pike County) | Pike County | 4 | 82 |
| Ross Township (Vermilion County) | Vermilion County | 2 | 1,215 |
| Rossville | Vermilion County | 1 | 1,383 |
| Round Grove Township | Livingston County | 4 | 404 |
| Round Lake | Lake County | 1 | 17,773 |
| Round Lake Beach | Lake County | 3 | 28,133 |
| Round Lake Heights | Lake County | 2 | 2,818 |
| Round Lake Park | Lake County | 2 | 7,382 |
| Rountree Township | Montgomery County | 5 | 120 |
| Roxana | Madison County | 1 | 1,572 |
| Royal | Champaign County | 1 | 252 |
| Royal Lakes | Macoupin County | 1 | 225 |
| Royalton | Franklin County | 1 | 1,122 |
| Rozetta Township | Henderson County | 1 | 223 |
| Rubicon Township | Greene County | 1 | 429 |
| Ruma | Randolph County | 2 | 339 |
| Rural Township (Rock Island County) | Rock Island County | 4 | 1,080 |
| Rural Township (Shelby County) | Shelby County | 4 | 412 |
| Rush Township | Jo Daviess County | 3 | 336 |
| Rushville | Schuyler County | 1 | 3,405 |
| Rushville Township | Schuyler County | 2 | 2,291 |
| Russell Township | Lawrence County | 3 | 254 |
| Russellville | Lawrence County | 1 | 51 |
| Rutland | LaSalle County | 1 | 302 |
| Rutland Township (Kane County) | Kane County | 7 | 26,005 |
| Rutland Township (LaSalle County) | LaSalle County | 4 | 3,595 |
| Rutledge Township | De Witt County | 3 | 15 |
| Ruyle Township | Jersey County | 1 | 247 |
| Sadorus | Champaign County | 1 | 564 |
| Sadorus Township | Champaign County | 3 | 812 |
| Sailor Springs | Clay County | 1 | 113 |
| Salem | Marion County | 1 | 7,407 |
| Salem Township (Carroll County) | Carroll County | 3 | 333 |
| Salem Township (Knox County) | Knox County | 4 | 1,062 |
| Salem Township (Marion County) | Marion County | 3 | 9,074 |
| Salina Township | Kankakee County | 4 | 1,249 |
| Saline Township | Madison County | 3 | 6,859 |
| Salt Creek Township | Mason County | 3 | 284 |
| Sammons Point | Kankakee County | 2 | 294 |
| San Jose | Mason County | 1 | 643 |
| Sand Prairie Township | Tazewell County | 3 | 1,581 |
| Sand Ridge Township | Jackson County | 3 | 1,074 |
| Sandoval | Marion County | 1 | 1,104 |
| Sandoval Township | Marion County | 3 | 2,263 |
| Sandwich | DeKalb County | 1 | 7,563 |
| Sandwich Township | DeKalb County | 3 | 7,522 |
| Sangamon Township | Piatt County | 4 | 2,481 |
| Sangamon Valley Township | Cass County | 2 | 458 |
| Santa Anna Township | De Witt County | 1 | 2,163 |
| Santa Fe Township | Clinton County | 2 | 1,366 |
| Saratoga Township (Grundy County) | Grundy County | 2 | 6,386 |
| Saratoga Township (Marshall County) | Marshall County | 3 | 347 |
| Sargent Township | Douglas County | 5 | 223 |
| Sauget | Saint Clair County | 3 | 221 |
| Sauk Village | Cook County | 1 | 10,473 |
| Saunemin | Livingston County | 1 | 326 |
| Saunemin Township | Livingston County | 4 | 707 |
| Savanna | Carroll County | 1 | 2,967 |
| Savanna Township | Carroll County | 2 | 3,598 |
| Savoy | Champaign County | 1 | 6,989 |
| Sawyerville | Macoupin County | 1 | 251 |
| Saybrook | Mclean County | 1 | 759 |
| Scales Mound | Jo Daviess County | 1 | 423 |
| Scales Mound Township | Jo Daviess County | 2 | 700 |
| Schaumburg | Cook County | 4 | 74,276 |
| Schaumburg Township | Cook County | 12 | 134,283 |
| Schiller Park | Cook County | 1 | 11,782 |
| Schram City | Montgomery County | 1 | 426 |
| Sciota | Mcdonough County | 1 | 83 |
| Sciota Township | Mcdonough County | 3 | 460 |
| Scotland Township | Mcdonough County | 1 | 136 |
| Scott AFB | Saint Clair County | 3 | 3,822 |
| Scott Township (Champaign County) | Champaign County | 4 | 1,303 |
| Scott Township (Ogle County) | Ogle County | 4 | 3,271 |
| Scottville | Macoupin County | 2 | 130 |
| Scottville Township | Macoupin County | 3 | 328 |
| Seaton | Mercer County | 1 | 296 |
| Seatonville | Bureau County | 1 | 281 |
| Secor | Woodford County | 1 | 452 |
| Sefton Township | Fayette County | 2 | 518 |
| Selby Township | Bureau County | 4 | 2,220 |
| Seminary Township | Fayette County | 1 | 597 |
| Senachwine Township | Putnam County | 2 | 508 |
| Seneca | LaSalle County | 1 | 2,476 |
| Seneca Township | Mchenry County | 4 | 2,893 |
| Serena | LaSalle County | 1 | 137 |
| Serena Township | LaSalle County | 4 | 1,036 |
| Sesser | Franklin County | 1 | 2,083 |
| Seven Hickory Township | Coles County | 4 | 187 |
| Seward Township (Kendall County) | Kendall County | 3 | 6,401 |
| Seward Township (Winnebago County) | Winnebago County | 3 | 748 |
| Seymour | Champaign County | 1 | 264 |
| Shabbona | DeKalb County | 1 | 884 |
| Shabbona Township | DeKalb County | 4 | 1,309 |
| Shafter Township | Fayette County | 2 | 797 |
| Shannon | Carroll County | 1 | 851 |
| Sharon Township | Fayette County | 3 | 2,171 |
| Shawnee Township | Gallatin County | 3 | 136 |
| Shawneetown | Gallatin County | 1 | 1,213 |
| Shaws Point Township | Macoupin County | 5 | 433 |
| Sheffield | Bureau County | 1 | 1,021 |
| Shelbyville | Shelby County | 1 | 5,267 |
| Shelbyville Township | Shelby County | 2 | 4,521 |
| Sheldon | Iroquois County | 1 | 991 |
| Sheldon Township | Iroquois County | 3 | 1,409 |
| Sheridan | LaSalle County | 1 | 1,522 |
| Sheridan Township | Logan County | 4 | 470 |
| Sherman | Sangamon County | 1 | 3,893 |
| Sherman Township | Mason County | 2 | 488 |
| Sherrard | Mercer County | 1 | 834 |
| Shields Township | Lake County | 5 | 37,391 |
| Shiloh | Saint Clair County | 4 | 12,726 |
| Shiloh Township (Edgar County) | Edgar County | 6 | 73 |
| Shiloh Township (Jefferson County) | Jefferson County | 2 | 6,603 |
| Shiloh Valley Township | Saint Clair County | 7 | 12,713 |
| Shipman | Macoupin County | 1 | 816 |
| Shipman Township | Macoupin County | 3 | 1,207 |
| Shirland Township | Winnebago County | 3 | 863 |
| Shirley | Mclean County | 1 | 94 |
| Shoal Creek Township | Bond County | 5 | 1,324 |
| Shorewood | Will County | 1 | 15,611 |
| Shumway | Effingham County | 1 | 150 |
| Sibley | Ford County | 1 | 343 |
| Sidell | Vermilion County | 1 | 665 |
| Sidell Township | Vermilion County | 3 | 832 |
| Sidney | Champaign County | 1 | 1,215 |
| Sidney Township | Champaign County | 3 | 1,631 |
| Sigel | Shelby County | 1 | 317 |
| Sigel Township | Shelby County | 3 | 951 |
| Silver Creek Township | Stephenson County | 4 | 625 |
| Silvis | Rock Island County | 1 | 7,474 |
| Simpson | Johnson County | 1 | 103 |
| Sims | Wayne County | 1 | 346 |
| Six Mile Township | Franklin County | 4 | 3,552 |
| Skokie | Cook County | 2 | 64,588 |
| Sleepy Hollow | Kane County | 3 | 3,348 |
| Smallwood Township | Jasper County | 2 | 184 |
| Smithboro | Bond County | 1 | 134 |
| Smithfield | Fulton County | 1 | 301 |
| Smithton | Saint Clair County | 1 | 3,648 |
| Smithton Township | Saint Clair County | 6 | 4,183 |
| Smithville | Peoria County | 1 | 171 |
| Solon Mills | Mchenry County | 3 | 177 |
| Somer Township | Champaign County | 3 | 784 |
| Somerset Township | Jackson County | 3 | 4,003 |
| Somonauk | DeKalb County | 1 | 2,201 |
| Somonauk Township | DeKalb County | 4 | 1,844 |
| Songer Township | Clay County | 2 | 249 |
| Sonora Township | Hancock County | 4 | 468 |
| Sorento | Bond County | 1 | 691 |
| South Barrington | Cook County | 4 | 4,738 |
| South Beloit | Winnebago County | 1 | 7,917 |
| South Chicago Heights | Cook County | 2 | 4,123 |
| South Crouch Township | Hamilton County | 2 | 299 |
| South Dixon Township | Lee County | 3 | 1,094 |
| South Elgin | Kane County | 1 | 21,873 |
| South Flannigan Township | Hamilton County | 3 | 64 |
| South Fork Township | Christian County | 8 | 2,662 |
| South Grove Township | DeKalb County | 5 | 394 |
| South Holland | Cook County | 1 | 21,994 |
| South Homer Township | Champaign County | 2 | 1,637 |
| South Hurricane Township | Fayette County | 2 | 283 |
| South Jacksonville | Morgan County | 1 | 3,330 |
| South Litchfield Township | Montgomery County | 3 | 3,291 |
| South Macon Township | Macon County | 3 | 1,306 |
| South Moline Township | Rock Island County | 3 | 36,536 |
| South Muddy Township | Jasper County | 4 | 540 |
| South Ottawa Township | LaSalle County | 1 | 8,355 |
| South Otter Township | Macoupin County | 3 | 240 |
| South Palmyra Township | Macoupin County | 3 | 669 |
| South Pekin | Tazewell County | 1 | 1,226 |
| South Rock Island Township | Rock Island County | 2 | 18,372 |
| South Ross Township | Vermilion County | 5 | 1,098 |
| South Roxana | Madison County | 1 | 2,240 |
| South Twigg Township | Hamilton County | 4 | 108 |
| South Wheatland Township | Macon County | 3 | 3,998 |
| South Wilmington | Grundy County | 1 | 617 |
| Southern View | Sangamon County | 1 | 1,822 |
| Southwest Township | Crawford County | 3 | 36 |
| Sparland | Marshall County | 1 | 455 |
| Sparta | Randolph County | 1 | 4,307 |
| Sparta Township | Knox County | 4 | 1,019 |
| Spaulding | Sangamon County | 3 | 858 |
| Spillertown | Williamson County | 1 | 207 |
| Spring Bay | Woodford County | 2 | 592 |
| Spring Bay Township | Woodford County | 2 | 2,545 |
| Spring Creek Township | Pike County | 3 | 540 |
| Spring Garden Township | Jefferson County | 4 | 2,878 |
| Spring Grove | Mchenry County | 1 | 5,452 |
| Spring Grove Township | Warren County | 4 | 997 |
| Spring Lake Township | Tazewell County | 4 | 1,476 |
| Spring Point Township | Cumberland County | 5 | 1,117 |
| Spring Township | Boone County | 4 | 1,054 |
| Spring Valley | Bureau County | 1 | 5,530 |
| Springerton | White County | 1 | 94 |
| Springfield | Sangamon County | 7 | 115,982 |
| Springfield Township | Sangamon County | 5 | 5,615 |
| Squaw Grove Township | DeKalb County | 6 | 2,724 |
| St. Albans Township | Hancock County | 2 | 428 |
| St. Anne | Kankakee County | 1 | 1,369 |
| St. Anne Township | Kankakee County | 3 | 2,142 |
| St. Augustine | Knox County | 1 | 118 |
| St. Charles | Kane County | 6 | 33,046 |
| St. Charles Township | Kane County | 8 | 52,020 |
| St. Clair Township | Saint Clair County | 5 | 35,790 |
| St. David | Fulton County | 2 | 432 |
| St. Elmo | Fayette County | 1 | 1,558 |
| St. Francis Township | Effingham County | 4 | 1,365 |
| St. Francisville | Lawrence County | 1 | 654 |
| St. Jacob | Madison County | 2 | 1,412 |
| St. Jacob Township | Madison County | 4 | 2,885 |
| St. Johns | Perry County | 1 | 164 |
| St. Joseph | Champaign County | 1 | 3,804 |
| St. Joseph Township | Champaign County | 2 | 5,610 |
| St. Libory | Saint Clair County | 3 | 619 |
| St. Mary Township | Hancock County | 2 | 692 |
| St. Peter | Fayette County | 1 | 300 |
| St. Rose | Clinton County | 1 | 466 |
| St. Rose Township | Clinton County | 5 | 1,574 |
| Standard | Putnam County | 1 | 261 |
| Standard City | Macoupin County | 1 | 195 |
| Stanford | Mclean County | 1 | 783 |
| Stanford Township | Clay County | 2 | 596 |
| Stanton Township | Champaign County | 2 | 541 |
| Staunton | Macoupin County | 1 | 4,989 |
| Staunton Township | Macoupin County | 3 | 5,518 |
| Ste. Marie | Jasper County | 3 | 257 |
| Ste. Marie Township | Jasper County | 4 | 586 |
| Steeleville | Randolph County | 1 | 1,989 |
| Steger | Cook County | 1 | 9,629 |
| Sterling | Whiteside County | 1 | 15,367 |
| Sterling Township | Whiteside County | 2 | 17,396 |
| Steuben Township | Marshall County | 2 | 1,095 |
| Stevenson Township | Marion County | 3 | 915 |
| Steward | Lee County | 1 | 294 |
| Stewardson | Shelby County | 1 | 775 |
| Stickney | Cook County | 3 | 6,731 |
| Stickney Township | Cook County | 5 | 41,351 |
| Stillman Valley | Ogle County | 1 | 1,018 |
| Stites Township | Saint Clair County | 5 | 627 |
| Stockland Township | Iroquois County | 2 | 221 |
| Stockton | Jo Daviess County | 1 | 1,922 |
| Stockton Township | Jo Daviess County | 1 | 2,278 |
| Stone Park | Cook County | 1 | 4,942 |
| Stonefort | Saline County | 1 | 292 |
| Stonefort Township | Saline County | 3 | 405 |
| Stonington | Christian County | 1 | 816 |
| Stonington Township | Christian County | 3 | 924 |
| Stookey Township | Saint Clair County | 5 | 9,295 |
| Stoy | Crawford County | 1 | 110 |
| Strasburg | Shelby County | 1 | 658 |
| Stratton Township | Edgar County | 2 | 531 |
| Strawn | Livingston County | 1 | 128 |
| Streamwood | Cook County | 1 | 40,201 |
| Streator | LaSalle County | 1 | 13,068 |
| Stronghurst | Henderson County | 1 | 1,045 |
| Stronghurst Township | Henderson County | 4 | 1,025 |
| Sublette | Lee County | 1 | 393 |
| Sublette Township | Lee County | 5 | 851 |
| Suez Township | Mercer County | 3 | 570 |
| Sugar Creek Township | Clinton County | 3 | 6,590 |
| Sugar Grove | Kane County | 1 | 8,831 |
| Sugar Grove Township | Kane County | 4 | 20,711 |
| Sugar Loaf Township | Saint Clair County | 7 | 6,997 |
| Sullivan | Moultrie County | 1 | 4,462 |
| Sullivan Township (Livingston County) | Livingston County | 3 | 692 |
| Sullivan Township (Moultrie County) | Moultrie County | 3 | 6,322 |
| Sullivant Township | Ford County | 2 | 305 |
| Summerfield | Saint Clair County | 1 | 468 |
| Summit | Cook County | 4 | 11,166 |
| Summit Township | Effingham County | 4 | 3,750 |
| Sumner | Lawrence County | 1 | 5,073 |
| Sumner Township (Kankakee County) | Kankakee County | 3 | 682 |
| Sumner Township (Warren County) | Warren County | 3 | 485 |
| Sumpter Township | Cumberland County | 3 | 2,105 |
| Sun River Terrace | Kankakee County | 2 | 399 |
| Sunbury Township | Livingston County | 3 | 138 |
| Sunnyland | Will County | 2 | 565 |
| Swan Township | Warren County | 3 | 149 |
| Swansea | Saint Clair County | 5 | 13,495 |
| Swedona | Mercer County | 2 | 95 |
| Sycamore | DeKalb County | 1 | 17,505 |
| Sycamore Township | DeKalb County | 4 | 14,615 |
| Symerton | Will County | 1 | 67 |
| Symmes Township | Edgar County | 3 | 871 |
| Table Grove | Fulton County | 1 | 438 |
| Talkington Township | Sangamon County | 3 | 68 |
| Tallula | Menard County | 1 | 596 |
| Tamalco Township | Bond County | 3 | 553 |
| Tamaroa | Perry County | 1 | 758 |
| Tamms | Alexander County | 1 | 765 |
| Tampico | Whiteside County | 1 | 867 |
| Tampico Township | Whiteside County | 3 | 955 |
| Tate Township | Saline County | 2 | 221 |
| Taylor Ridge | Rock Island County | 1 | 142 |
| Taylor Springs | Montgomery County | 1 | 594 |
| Taylor Township | Ogle County | 4 | 660 |
| Taylorville | Christian County | 1 | 11,768 |
| Taylorville Township | Christian County | 2 | 11,981 |
| Tennessee | Mcdonough County | 1 | 172 |
| Tennessee Township | Mcdonough County | 3 | 321 |
| Terre Haute Township | Henderson County | 1 | 204 |
| Teutopolis | Effingham County | 1 | 1,817 |
| Teutopolis Township | Effingham County | 2 | 2,729 |
| Texas Township | De Witt County | 2 | 1,298 |
| Thawville | Iroquois County | 1 | 166 |
| Thayer | Sangamon County | 1 | 555 |
| The Galena Territory | Jo Daviess County | 2 | 979 |
| Thebes | Alexander County | 1 | 479 |
| Third Lake | Lake County | 2 | 1,448 |
| Thomasboro | Champaign County | 1 | 1,082 |
| Thompson Township | Jo Daviess County | 4 | 901 |
| Thompsonville | Franklin County | 1 | 689 |
| Thomson | Carroll County | 1 | 675 |
| Thornton | Cook County | 1 | 2,718 |
| Thornton Township | Cook County | 14 | 158,965 |
| Tilden | Randolph County | 1 | 780 |
| Tilton | Vermilion County | 1 | 2,717 |
| Timber Township | Peoria County | 5 | 2,393 |
| Timberlane | Boone County | 3 | 1,118 |
| Time | Pike County | 1 | 21 |
| Tinley Park | Cook County | 2 | 56,340 |
| Tiskilwa | Bureau County | 1 | 870 |
| Todds Point Township | Shelby County | 2 | 459 |
| Toledo | Cumberland County | 1 | 1,119 |
| Tolono | Champaign County | 1 | 3,474 |
| Tolono Township | Champaign County | 4 | 6,177 |
| Toluca | Marshall County | 1 | 1,366 |
| Tompkins Township | Warren County | 4 | 1,021 |
| Tonica | LaSalle County | 1 | 850 |
| Tonti Township | Marion County | 4 | 1,060 |
| Topeka | Mason County | 1 | 41 |
| Toulon | Stark County | 1 | 1,286 |
| Toulon Township | Stark County | 2 | 2,479 |
| Tovey | Christian County | 1 | 492 |
| Towanda | Mclean County | 1 | 586 |
| Towanda Township | Mclean County | 4 | 1,942 |
| Tower Hill | Shelby County | 1 | 816 |
| Tower Hill Township | Shelby County | 3 | 1,058 |
| Tower Lakes | Lake County | 1 | 1,430 |
| Tremont | Tazewell County | 1 | 2,250 |
| Tremont Township | Tazewell County | 4 | 2,686 |
| Trenton | Clinton County | 1 | 2,717 |
| Trilla | Coles County | 1 | 338 |
| Triumph | LaSalle County | 1 | 82 |
| Trivoli | Peoria County | 1 | 380 |
| Trivoli Township | Peoria County | 3 | 896 |
| Trout Valley | Mchenry County | 1 | 584 |
| Troy | Madison County | 1 | 9,959 |
| Troy Grove | LaSalle County | 1 | 204 |
| Troy Grove Township | LaSalle County | 4 | 1,281 |
| Troy Township | Will County | 8 | 49,220 |
| Truro Township | Knox County | 3 | 767 |
| Tunbridge Township | De Witt County | 3 | 801 |
| Tuscola | Douglas County | 1 | 4,280 |
| Tuscola Township | Douglas County | 1 | 5,415 |
| Twigg Township | Hamilton County | 3 | 422 |
| Twin Grove | Mclean County | 1 | 1,504 |
| Tyrone Township | Franklin County | 5 | 4,753 |
| Ullin | Pulaski County | 1 | 611 |
| Union | Mchenry County | 1 | 719 |
| Union Grove Township | Whiteside County | 3 | 1,140 |
| Union Hill | Kankakee County | 1 | 50 |
| Union Township (Cumberland County) | Cumberland County | 4 | 281 |
| Union Township (Effingham County) | Effingham County | 4 | 618 |
| Union Township (Fulton County) | Fulton County | 2 | 888 |
| Union Township (Livingston County) | Livingston County | 5 | 146 |
| Unity | Alexander County | 2 | 62 |
| Unity Township | Piatt County | 3 | 1,407 |
| University Park | Will County | 1 | 7,034 |
| Urbana | Champaign County | 2 | 41,299 |
| Urbana Township | Champaign County | 4 | 7,515 |
| Ursa | Adams County | 1 | 626 |
| Ursa Township | Adams County | 4 | 763 |
| Ustick Township | Whiteside County | 2 | 589 |
| Utica Township | LaSalle County | 4 | 1,833 |
| Valier | Franklin County | 1 | 603 |
| Valley City | Pike County | 1 | 0 |
| Valley Township | Stark County | 3 | 191 |
| Valmeyer | Monroe County | 1 | 1,641 |
| Vance Township | Vermilion County | 3 | 1,060 |
| Vandalia | Fayette County | 1 | 6,096 |
| Vandalia Township | Fayette County | 2 | 6,528 |
| Varna | Marshall County | 1 | 369 |
| Venedy | Washington County | 1 | 108 |
| Venedy Township | Washington County | 5 | 319 |
| Venetian Village | Lake County | 2 | 2,703 |
| Venice | Madison County | 1 | 1,608 |
| Venice Township | Madison County | 5 | 4,804 |
| Vergennes | Jackson County | 1 | 396 |
| Vergennes Township | Jackson County | 4 | 714 |
| Vermilion | Edgar County | 1 | 204 |
| Vermillion Township | LaSalle County | 5 | 321 |
| Vermont | Fulton County | 1 | 748 |
| Vermont Township | Fulton County | 3 | 898 |
| Vernon | Marion County | 1 | 125 |
| Vernon Hills | Lake County | 1 | 25,144 |
| Vernon Township | Lake County | 9 | 71,072 |
| Verona | Grundy County | 1 | 196 |
| Versailles | Brown County | 1 | 391 |
| Versailles Township | Brown County | 3 | 599 |
| Victor Township | DeKalb County | 4 | 269 |
| Victoria | Knox County | 1 | 327 |
| Victoria Township | Knox County | 4 | 329 |
| Vienna | Johnson County | 1 | 1,327 |
| Vienna Township | Grundy County | 4 | 655 |
| Villa Grove | Douglas County | 1 | 2,411 |
| Villa Park | DuPage County | 1 | 22,212 |
| Vinegar Hill Township | Jo Daviess County | 2 | 467 |
| Viola | Mercer County | 1 | 1,030 |
| Viola Township | Lee County | 4 | 457 |
| Virden | Macoupin County | 1 | 3,605 |
| Virden Township | Macoupin County | 2 | 3,386 |
| Virgil | Kane County | 1 | 375 |
| Virgil Township | Kane County | 1 | 1,990 |
| Virginia | Cass County | 1 | 1,516 |
| Virginia Township | Cass County | 2 | 1,655 |
| Volo | Lake County | 6 | 2,996 |
| Wabash Township | Clark County | 3 | 1,644 |
| Waddams Township | Stephenson County | 5 | 685 |
| Wade Township (Clinton County) | Clinton County | 3 | 1,709 |
| Wade Township (Jasper County) | Jasper County | 3 | 4,352 |
| Wadsworth | Lake County | 1 | 3,783 |
| Waggoner | Montgomery County | 1 | 168 |
| Waldo Township | Livingston County | 2 | 262 |
| Walker Township | Hancock County | 4 | 292 |
| Walkerville Township | Greene County | 2 | 95 |
| Wall Township | Ford County | 3 | 153 |
| Wallace Township | LaSalle County | 1 | 642 |
| Walnut | Bureau County | 1 | 1,504 |
| Walnut Grove Township (Knox County) | Knox County | 3 | 728 |
| Walnut Grove Township (Mcdonough County) | Mcdonough County | 3 | 567 |
| Walnut Hill | Marion County | 1 | 67 |
| Walnut Township | Bureau County | 1 | 1,339 |
| Walshville | Montgomery County | 1 | 53 |
| Walshville Township | Montgomery County | 5 | 445 |
| Waltham Township | LaSalle County | 3 | 662 |
| Waltonville | Jefferson County | 1 | 420 |
| Wamac | Marion County | 1 | 1,455 |
| Wapella | De Witt County | 1 | 490 |
| Wapella Township | De Witt County | 3 | 1,192 |
| Wards Grove Township | Jo Daviess County | 4 | 239 |
| Warren | Jo Daviess County | 1 | 1,568 |
| Warren Township (Jo Daviess County) | Jo Daviess County | 2 | 1,543 |
| Warren Township (Lake County) | Lake County | 7 | 65,932 |
| Warrensburg | Macon County | 1 | 1,087 |
| Warrenville | DuPage County | 1 | 13,346 |
| Warsaw | Hancock County | 1 | 1,581 |
| Warsaw Township | Hancock County | 1 | 1,631 |
| Washburn | Woodford County | 1 | 1,171 |
| Washington | Tazewell County | 1 | 15,052 |
| Washington Park | Saint Clair County | 4 | 4,258 |
| Washington Township (Carroll County) | Carroll County | 3 | 348 |
| Washington Township (Tazewell County) | Tazewell County | 4 | 24,473 |
| Washington Township (Will County) | Will County | 2 | 6,477 |
| Wataga | Knox County | 1 | 935 |
| Waterford Township | Fulton County | 1 | 77 |
| Waterloo | Monroe County | 1 | 9,826 |
| Waterman | DeKalb County | 1 | 1,501 |
| Watseka | Iroquois County | 1 | 5,630 |
| Watson | Effingham County | 1 | 711 |
| Watson Township | Effingham County | 4 | 3,200 |
| Wauconda | Lake County | 1 | 12,960 |
| Wauconda Township | Lake County | 7 | 23,501 |
| Waukegan | Lake County | 2 | 88,982 |
| Waukegan Township | Lake County | 5 | 90,552 |
| Wauponsee Township | Grundy County | 2 | 2,034 |
| Waverly | Morgan County | 1 | 1,449 |
| Wayne | DuPage County | 1 | 2,760 |
| Wayne City | Wayne County | 1 | 1,188 |
| Wayne Township | DuPage County | 8 | 64,888 |
| Waynesville | De Witt County | 1 | 556 |
| Waynesville Township | De Witt County | 2 | 517 |
| Webber Township | Jefferson County | 3 | 2,046 |
| Wedron | LaSalle County | 1 | 170 |
| Weldon | De Witt County | 1 | 349 |
| Weller Township | Henry County | 5 | 295 |
| Wellington | Iroquois County | 1 | 215 |
| Wenona | Marshall County | 1 | 1,093 |
| Wenonah | Montgomery County | 1 | 22 |
| Wesley Township | Will County | 2 | 1,881 |
| West Brooklyn | Lee County | 1 | 143 |
| West Chicago | DuPage County | 1 | 27,079 |
| West City | Franklin County | 1 | 803 |
| West Deerfield Township | Lake County | 4 | 31,632 |
| West Dundee | Kane County | 3 | 7,307 |
| West Frankfort | Franklin County | 1 | 8,394 |
| West Galena Township | Jo Daviess County | 1 | 3,218 |
| West Jersey Township | Stark County | 2 | 134 |
| West Liberty | Jasper County | 1 | 192 |
| West Lincoln Township | Logan County | 2 | 7,287 |
| West Peoria | Peoria County | 3 | 4,487 |
| West Peoria Township | Peoria County | 6 | 4,300 |
| West Point | Hancock County | 1 | 221 |
| West Point Township | Stephenson County | 2 | 3,203 |
| West Salem | Edwards County | 1 | 931 |
| West Township (Effingham County) | Effingham County | 4 | 563 |
| West Township (Mclean County) | Mclean County | 5 | 180 |
| West Union | Clark County | 1 | 405 |
| West York | Crawford County | 1 | 99 |
| Westchester | Cook County | 1 | 16,684 |
| Western Mound Township | Macoupin County | 3 | 368 |
| Western Springs | Cook County | 1 | 12,853 |
| Western Township | Henry County | 4 | 2,953 |
| Westervelt | Shelby County | 1 | 99 |
| Westfield | Clark County | 1 | 597 |
| Westfield Township (Bureau County) | Bureau County | 5 | 863 |
| Westfield Township (Clark County) | Clark County | 3 | 627 |
| Westlake Village | Winnebago County | 1 | 1,744 |
| Westmont | DuPage County | 1 | 25,101 |
| Westville | Vermilion County | 1 | 3,173 |
| Wethersfield Township | Henry County | 3 | 3,802 |
| Wheatfield Township | Clinton County | 3 | 313 |
| Wheatland Township (Bureau County) | Bureau County | 2 | 41 |
| Wheatland Township (Fayette County) | Fayette County | 3 | 465 |
| Wheatland Township (Will County) | Will County | 7 | 88,314 |
| Wheaton | DuPage County | 2 | 53,155 |
| Wheeler | Jasper County | 1 | 123 |
| Wheeling | Cook County | 1 | 37,575 |
| Wheeling Township | Cook County | 11 | 156,954 |
| White City | Macoupin County | 1 | 220 |
| White Hall | Greene County | 1 | 2,609 |
| White Hall Township | Greene County | 2 | 2,631 |
| White Heath | Piatt County | 1 | 235 |
| White Oak Township | Mclean County | 2 | 949 |
| White Rock Township | Ogle County | 4 | 915 |
| Whiteash | Williamson County | 1 | 282 |
| Whitefield Township | Marshall County | 2 | 247 |
| Whitley Township | Moultrie County | 3 | 686 |
| Whitmore Township | Macon County | 5 | 4,279 |
| Wilberton Township | Fayette County | 3 | 455 |
| Will Township | Will County | 4 | 1,781 |
| Williams Township | Sangamon County | 5 | 3,462 |
| Williamsfield | Knox County | 1 | 608 |
| Williamson | Madison County | 1 | 244 |
| Williamsville | Sangamon County | 1 | 1,530 |
| Willisville | Perry County | 1 | 499 |
| Willow Branch Township | Piatt County | 6 | 934 |
| Willow Creek Township | Lee County | 4 | 531 |
| Willow Hill | Jasper County | 1 | 214 |
| Willow Hill Township | Jasper County | 3 | 450 |
| Willow Lake | Stephenson County | 1 | 752 |
| Willow Springs | Cook County | 1 | 5,455 |
| Willowbrook | DuPage County | 1 | 8,575 |
| Willowbrook (Will County) | Will County | 2 | 2,107 |
| Wilmette | Cook County | 1 | 27,202 |
| Wilmington | Will County | 1 | 5,918 |
| Wilmington (Greene County) | Greene County | 1 | 155 |
| Wilmington Township | Will County | 4 | 5,983 |
| Wilson Township | De Witt County | 4 | 129 |
| Wilsonville | Macoupin County | 1 | 516 |
| Wilton Center | Will County | 1 | 127 |
| Wilton Township | Will County | 3 | 920 |
| Winchester | Scott County | 1 | 1,613 |
| Windsor | Shelby County | 1 | 1,273 |
| Windsor (Mercer County) | Mercer County | 1 | 825 |
| Windsor Township | Shelby County | 2 | 1,249 |
| Winfield | DuPage County | 1 | 9,168 |
| Winfield Township | DuPage County | 9 | 46,432 |
| Winnebago | Winnebago County | 1 | 3,473 |
| Winnebago Township | Winnebago County | 4 | 5,010 |
| Winnetka | Cook County | 1 | 12,210 |
| Winslow | Stephenson County | 1 | 239 |
| Winslow Township | Stephenson County | 2 | 461 |
| Winthrop Harbor | Lake County | 1 | 6,752 |
| Witt | Montgomery County | 1 | 782 |
| Witt Township | Montgomery County | 5 | 991 |
| Wonder Lake | Mchenry County | 1 | 3,672 |
| Wood Dale | DuPage County | 1 | 13,778 |
| Wood River | Madison County | 1 | 10,643 |
| Wood River Township | Madison County | 9 | 30,313 |
| Woodbine Township | Jo Daviess County | 2 | 425 |
| Woodbury Township | Cumberland County | 4 | 659 |
| Woodhull | Henry County | 1 | 849 |
| Woodland | Iroquois County | 1 | 278 |
| Woodland Township (Carroll County) | Carroll County | 3 | 343 |
| Woodland Township (Fulton County) | Fulton County | 2 | 192 |
| Woodlawn | Jefferson County | 1 | 719 |
| Woodridge | DuPage County | 1 | 32,926 |
| Woodside Township | Sangamon County | 5 | 11,514 |
| Woodson | Morgan County | 1 | 583 |
| Woodstock | Mchenry County | 1 | 24,781 |
| Woodstock Township | Schuyler County | 3 | 534 |
| Woodville Township | Greene County | 4 | 146 |
| Woosung Township | Ogle County | 3 | 444 |
| Worden | Madison County | 1 | 1,096 |
| Worth | Cook County | 1 | 10,787 |
| Worth Township (Cook County) | Cook County | 13 | 152,568 |
| Worth Township (Woodford County) | Woodford County | 2 | 8,863 |
| Wrights Township | Greene County | 3 | 254 |
| Wyanet | Bureau County | 1 | 1,186 |
| Wyanet Township | Bureau County | 2 | 1,229 |
| Wyoming | Stark County | 1 | 1,491 |
| Wyoming Township | Lee County | 4 | 1,283 |
| Wysox Township | Carroll County | 3 | 1,275 |
| Wythe Township | Hancock County | 3 | 263 |
| Xenia | Clay County | 1 | 538 |
| Xenia Township | Clay County | 1 | 522 |
| Yale | Jasper County | 1 | 71 |
| Yates City | Knox County | 1 | 887 |
| Yates Township | Mclean County | 1 | 279 |
| Yellowhead Township | Kankakee County | 3 | 2,566 |
| York Township (Carroll County) | Carroll County | 4 | 2,404 |
| York Township (Clark County) | Clark County | 3 | 467 |
| York Township (DuPage County) | DuPage County | 8 | 128,065 |
| Yorktown Township | Henry County | 4 | 576 |
| Yorkville | Kendall County | 1 | 17,055 |
| Young America Township | Edgar County | 6 | 764 |
| Young Hickory Township | Fulton County | 3 | 729 |
| Zanesville Township | Montgomery County | 3 | 372 |
| Zeigler | Franklin County | 1 | 1,860 |
| Zif Township | Wayne County | 2 | 167 |
| Zion | Lake County | 1 | 24,400 |
| Zion Township | Lake County | 3 | 24,660 |
| Zuma Township | Rock Island County | 4 | 847 |