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 60096 Winthrop Harbor Lake County 224, 262, 847
IL 60097 Wonder Lake McHenry County 779, 815
IL 60098 Woodstock McHenry County 224, 779, 815, 847
IL 60099 Zion Lake County 224, 262, 847
IL 60101 Addison DuPage County 331, 630
IL 60102 Algonquin McHenry County 224, 847
IL 60103 Bartlett DuPage County 224, 331, 630, 847
IL 60104 Bellwood Cook County 464, 708
IL 60105 Bensenville Dupage County 630
IL 60106 Bensenville DuPage County 224, 331, 630, 773, 847, 872
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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.