Partisan Voting Index for Counties in Illinois

This Map Displays the Partisan Voting Index Value for each county in Illinois. The Partisan Voting Index (PVI) is a measurement of how strongly a county leans toward the Democratic or Republican Party. The PVI is calculated by taking the average percentage for the winning party in a county for the last two elections and subtracting that value from the national average for that party in the same two elections. The data is based on results from the 2020 and 2016 presidential election. Of the 102 Counties in Illinois The County with the highest Republican PVI is Wayne County at +35. The County with the highest Democrat PVI is Cook County at +28.

Map List Related

Map of Partisan Voting Index (PVI) for Counties in Illinois

Rep +20
Rep. 15-19
Rep. 10-14
Rep. 5-9
Rep. 1-4
Even
Dem 1-4
Dem 5-9
Dem 10-14
Dem 15-19
Dem +20

List of All Counties in Illinois With Partisan Voting Index (2020 Presidential Election Results)

Map KeyNamePartisan Voting Index (2020)
Adams CountyRepublican +22
Alexander CountyRepublican +5
Bond CountyRepublican +17
Boone CountyRepublican +5
Brown CountyRepublican +26
Bureau CountyRepublican +8
Calhoun CountyRepublican +21
Carroll CountyRepublican +12
Cass CountyRepublican +16
Champaign CountyDemocrat +11
Christian CountyRepublican +20
Clark CountyRepublican +23
Clay CountyRepublican +31
Clinton CountyRepublican +23
Coles CountyRepublican +11
Cook CountyDemocrat +28
Crawford CountyRepublican +24
Cumberland CountyRepublican +27
De Witt CountyRepublican +19
DeKalb CountyDemocrat +3
Douglas CountyRepublican +21
DuPage CountyDemocrat +9
Edgar CountyRepublican +24
Edwards CountyRepublican +34
Effingham CountyRepublican +28
Fayette CountyRepublican +29
Ford CountyRepublican +22
Franklin CountyRepublican +22
Fulton CountyRepublican +7
Gallatin CountyRepublican +24
Greene CountyRepublican +26
Grundy CountyRepublican +10
Hamilton CountyRepublican +28
Hancock CountyRepublican +22
Hardin CountyRepublican +28
Henderson CountyRepublican +14
Henry CountyRepublican +8
Iroquois CountyRepublican +26
Jackson CountyDemocrat +2
Jasper CountyRepublican +29
Jefferson CountyRepublican +20
Jersey CountyRepublican +22
Jo Daviess CountyRepublican +6
Johnson CountyRepublican +28
Kane CountyDemocrat +8
Kankakee CountyRepublican +5
Kendall CountyDemocrat +3
Knox CountyEven +0
LaSalle CountyRepublican +5
Lake CountyDemocrat +12
Lawrence CountyRepublican +25
Lee CountyRepublican +7
Livingston CountyRepublican +19
Logan CountyRepublican +18
Macon CountyRepublican +7
Macoupin CountyRepublican +16
Madison CountyRepublican +5
Marion CountyRepublican +21
Marshall CountyRepublican +15
Mason CountyRepublican +16
Massac CountyRepublican +23
Mcdonough CountyRepublican +5
Mchenry CountyRepublican +1
Mclean CountyDemocrat +1
Menard CountyRepublican +17
Mercer CountyRepublican +9
Monroe CountyRepublican +16
Montgomery CountyRepublican +18
Morgan CountyRepublican +13
Moultrie CountyRepublican +23
Ogle CountyRepublican +11
Peoria CountyDemocrat +4
Perry CountyRepublican +21
Piatt CountyRepublican +13
Pike CountyRepublican +28
Pope CountyRepublican +29
Pulaski CountyRepublican +13
Putnam CountyRepublican +8
Randolph CountyRepublican +23
Richland CountyRepublican +25
Rock Island CountyDemocrat +6
Saint Clair CountyDemocrat +5
Saline CountyRepublican +23
Sangamon CountyRepublican +1
Schuyler CountyRepublican +19
Scott CountyRepublican +27
Shelby CountyRepublican +27
Stark CountyRepublican +17
Stephenson CountyRepublican +6
Tazewell CountyRepublican +11
Union CountyRepublican +19
Vermilion CountyRepublican +14
Wabash CountyRepublican +25
Warren CountyRepublican +7
Washington CountyRepublican +26
Wayne CountyRepublican +35
White CountyRepublican +28
Whiteside CountyRepublican +1
Will CountyDemocrat +5
Williamson CountyRepublican +18
Winnebago CountyDemocrat +2
Woodford CountyRepublican +18

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