U.S. postal lookup

U.S. ZIP Codes Database 2026

Search by ZIP code, city, county, or state and find clear postal details with maps, time zones, and area code data.

42,735 verified records
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State directory

Illinois ZIP Codes

Complete postal directory, details, and geographic map for the State of Illinois.

State ZIP Code City County Area Codes
IL 62917 Carrier Mills Saline County 618
IL 62918 Carterville Williamson County 618
IL 62919 Cave In Rock Hardin County 270, 364, 618
IL 62920 Cobden Union County 618
IL 62921 Colp Williamson County 618
IL 62922 Creal Springs Williamson County 618
IL 62923 Cypress Johnson County 618
IL 62924 De Soto Jackson County 618
IL 62926 Dongola Union County 618
IL 62927 Dowell Jackson County 618
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About U.S. ZIP Codes

ZIP codes are a United States Postal Service system introduced in 1963 to make mail routing more accurate and efficient. The standard format uses five digits, while ZIP+4 adds four more digits for a more precise delivery segment.

ZIP codes cover the United States, its territories, military mail routes, and other USPS delivery points. This directory organizes that data for practical lookup by ZIP code, city, county, and state.