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 62325 Coatsburg Adams County 217, 447
IL 62326 Colchester McDonough County 217, 309, 447
IL 62329 Colusa Hancock County 217, 447
IL 62330 Dallas City Hancock County 217, 309, 319, 447
IL 62334 Elvaston Hancock County 217, 447
IL 62336 Ferris Hancock County 217, 447
IL 62338 Fowler Adams County 217, 447
IL 62339 Golden Adams County 217, 447
IL 62340 Griggsville Pike County 217, 447
IL 62341 Hamilton Hancock County 217, 319, 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.