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.

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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 62532 Elwin Macon County 217, 447
IL 62533 Farmersville Montgomery County 217, 447
IL 62534 Findlay Shelby County 217, 447
IL 62535 Forsyth Macon County 217, 447
IL 62536 Glenarm Sangamon County 217, 447
IL 62537 Harristown Macon County 217, 447
IL 62538 Harvel Montgomery County 217, 447
IL 62539 Illiopolis Sangamon County 217, 447
IL 62540 Kincaid Christian County 217, 447
IL 62541 Lake Fork Logan 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.