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
All states and U.S. territories
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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 61318 Compton Lee County 779, 815
IL 61319 Cornell Livingston County 779, 815
IL 61320 Dalzell Bureau County 779, 815
IL 61321 Dana LaSalle County 309, 779, 815
IL 61322 Depue Bureau County 779, 815
IL 61323 Dover Bureau County 779, 815
IL 61324 Eldena Lee County 779, 815
IL 61325 Grand Ridge LaSalle County 779, 815
IL 61326 Granville Putnam County 779, 815
IL 61327 Hennepin Putnam County 309, 779, 815
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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.