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 62974 Pittsburg Williamson County 618
IL 62975 Pomona Jackson County 618
IL 62976 Pulaski Pulaski County 618
IL 62977 Raleigh Saline County 618
IL 62979 Ridgway Gallatin County 618
IL 62982 Rosiclare Hardin County 270, 364, 618
IL 62983 Royalton Franklin County 618
IL 62984 Shawneetown Gallatin County 270, 364, 618, 812, 930
IL 62985 Simpson Johnson County 618
IL 62987 Stonefort Saline 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.