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 60075 Russell Lake County 224, 262, 847
IL 60076 Skokie Cook County 224, 773, 847, 872
IL 60077 Skokie Cook County 224, 773, 847, 872
IL 60078 Palatine Cook County 224
IL 60079 Waukegan Lake County 224
IL 60081 Spring Grove McHenry County 224, 779, 815, 847
IL 60082 Techny Cook County 224, 847
IL 60083 Wadsworth Lake County 224, 847
IL 60084 Wauconda Lake County 224, 779, 815, 847
IL 60085 Waukegan Lake County 224, 847
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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.