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 61737 Ellsworth McLean County 309
IL 61738 El Paso Woodford County 309, 779, 815
IL 61739 Fairbury Livingston County 309, 779, 815
IL 61740 Flanagan Livingston County 309, 779, 815
IL 61741 Forrest Livingston County 779, 815
IL 61742 Goodfield Woodford County 309
IL 61743 Graymont Livingston County 779, 815
IL 61744 Gridley McLean County 309, 779, 815
IL 61745 Heyworth McLean County 217, 309, 447
IL 61747 Hopedale Tazewell County 309
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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.