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
All states and U.S. territories
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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 60512 Bristol Kendall County 331, 630
IL 60513 Brookfield Cook County 464, 708
IL 60514 Clarendon Hills DuPage County 331, 630
IL 60515 Downers Grove DuPage County 331, 630
IL 60516 Downers Grove DuPage County 331, 630
IL 60517 Woodridge DuPage County 331, 630
IL 60518 Earlville LaSalle County 779, 815
IL 60519 Eola DuPage County 331, 630
IL 60520 Hinckley DeKalb County 331, 630, 779, 815
IL 60521 Hinsdale DuPage County 331, 464, 630, 708
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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.