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 60918 Buckley Iroquois County 217, 447, 779, 815
IL 60919 Cabery Ford County 779, 815
IL 60920 Campus Livingston County 779, 815
IL 60921 Chatsworth Livingston County 779, 815
IL 60922 Chebanse Kankakee County 779, 815
IL 60924 Cissna Park Iroquois County 779, 815
IL 60926 Claytonville Iroquois County 779, 815
IL 60927 Clifton Iroquois County 779, 815
IL 60928 Crescent City Iroquois County 779, 815
IL 60929 Cullom Livingston County 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.