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 62840 Frankfort Heights Franklin County 618
IL 62841 Freeman Spur Williamson County 618
IL 62842 Geff Wayne County 618
IL 62843 Golden Gate Wayne County 618
IL 62844 Grayville White County 618, 812, 930
IL 62846 Ina Jefferson County 618
IL 62848 Irvington Washington County 618
IL 62849 Iuka Marion County 618
IL 62850 Johnsonville Wayne County 618
IL 62851 Keenes Wayne 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.