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 61533 Glasford Peoria County 309
IL 61534 Green Valley Tazewell County 309
IL 61535 Groveland Tazewell County 309
IL 61536 Hanna City Peoria County 309
IL 61537 Henry Marshall County 309, 779, 815
IL 61539 Kingston Mines Peoria County 309
IL 61540 Lacon Marshall County 309
IL 61541 La Rose Marshall County 309
IL 61542 Lewistown Fulton County 309
IL 61543 Liverpool Fulton County 309
Page 78 of 159

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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.