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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Illinois ZIP Codes

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

State ZIP Code City County Area Codes
IL 62643 Hartsburg Logan County 217, 447
IL 62644 Havana Mason County 309
IL 62649 Hettick Macoupin County 217, 447
IL 62650 Jacksonville Morgan County 217, 447
IL 62651 Jacksonville Morgan County 217
IL 62655 Kilbourne Mason County 217, 309, 447
IL 62656 Lincoln Logan County 217, 447
IL 62659 Lincolns New Salem Menard County 217
IL 62660 Literberry Morgan County 217
IL 62661 Loami Sangamon County 217, 447
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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.