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Area Code 203Area Code 203 is in Connecticut and covers 1294.23 square miles. Area Code 203 contains 88 non-unique postal area zip codes. |
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| Area Code 203 Zipcodes | |
| 06403 Beacon Falls, CT |  |
| 06405 Branford, CT | |
| 06410 Cheshire, CT | |
| 06418 Derby, CT | |
| 06437 Guilford, CT | |
| 06450 Meriden, CT | |
| 06461 Milford, CT | |
| 06468 Monroe, CT | |
| 06471 North Branford, CT | |
| 06473 North Haven, CT | |
| 06477 Orange, CT | |
| 06483 Seymour, CT | |
| 06488 Southbury, CT | |
| 06492 Wallingford, CT | |
| 06511 New Haven, CT | |
| 06512 East Haven, CT | |
| 06513 New Haven, CT | |
| 06514 Hamden, CT | |
| 06515 New Haven, CT | |
| 06519 New Haven, CT | |
| 06604 Bridgeport, CT | |
| 06605 Bridgeport, CT | |
| 06606 Bridgeport, CT | |
| 06607 Bridgeport, CT | |
| 06610 Bridgeport, CT | |
| 06612 Easton, CT | |
| 06702 Waterbury, CT | |
| 06705 Waterbury, CT | |
| 06708 Waterbury, CT | |
| 06712 Prospect, CT | |
| 06716 Wolcott, CT | |
| 06751 Bethlehem, CT | |
| 06762 Middlebury, CT | |
| 06770 Naugatuck, CT | |
| 06798 Woodbury, CT | |
| 06807 Cos Cob, CT | |
| 06810 Danbury, CT | |
| 06811 Danbury, CT | |
| 06830 Greenwich, CT | |
| 06840 New Canaan, CT | |
| 06850 Norwalk, CT | |
| 06880 Westport, CT | |
| 06883 Weston, CT | |
| 06897 Wilton, CT | |
Adjacent Area Codes:
| Area Code 845 | Area Code 860 | Area Code 914 |
| 06901 Stamford, CT |
| 06902 Stamford, CT |
| 06905 Stamford, CT |
| 06906 Stamford, CT |
| 06907 Stamford, CT |
| 06608 Bridgeport, CT |
| 06478 Oxford, CT |
| 06517 Hamden, CT |
| 06853 Norwalk, CT |
| 06854 Norwalk, CT |
| 06611 Trumbull, CT |
| 06855 Norwalk, CT |
| 06878 Riverside, CT |
| 06825 Fairfield, CT |
| 06482 Sandy Hook, CT |
| 06831 Greenwich, CT |
| 06851 Norwalk, CT |
| 06401 Ansonia, CT |
| 06518 Hamden, CT |
| 06801 Bethel, CT |
| 06525 Woodbridge, CT |
| 06451 Meriden, CT |
| 06903 Stamford, CT |
| 06472 Northford, CT |
| 06484 Shelton, CT |
| 06470 Newtown, CT |
| 06524 Bethany, CT |
| 06614 Stratford, CT |
| 06890 Southport, CT |
| 06710 Waterbury, CT |
| 06510 New Haven, CT |
| 06804 Brookfield, CT |
| 06870 Old Greenwich, CT |
| 06615 Stratford, CT |
| 06443 Madison, CT |
| 06820 Darien, CT |
| 06877 Ridgefield, CT |
| 06704 Waterbury, CT |
| 06706 Waterbury, CT |
| 06896 Redding, CT |
| 06516 West Haven, CT |
| 06812 New Fairfield, CT |
| 06460 Milford, CT |
| 06824 Fairfield, CT |
data sources: