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 62953 Joppa Massac County 270, 364, 618
IL 62954 Junction Gallatin County 618
IL 62955 Karbers Ridge Hardin County 618
IL 62956 Karnak Pulaski County 618
IL 62957 Mc Clure Alexander County 573, 618
IL 62958 Makanda Jackson County 618
IL 62959 Marion Williamson County 618
IL 62960 Metropolis Massac County 270, 364, 618
IL 62961 Millcreek Union County 618
IL 62962 Miller City Alexander County 573, 618
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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.