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 62905 Alto Pass Union County 618
IL 62906 Anna Union County 618
IL 62907 Ava Jackson County 618
IL 62908 Belknap Massac County 618
IL 62909 Boles Johnson County 618
IL 62910 Brookport Massac County 270, 364, 618
IL 62912 Buncombe Johnson County 618
IL 62914 Cairo Alexander County 270, 364, 573, 618
IL 62915 Cambria Williamson County 618
IL 62916 Campbell Hill Jackson County 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.