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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.

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Cook County ZIP Codes

Browse all ZIP Codes, cities, and associated area codes registered in Cook County.

County State ZIP Code City Area Codes
Cook County IL 60076 Skokie 224, 773, 847, 872
Cook County IL 60077 Skokie 224, 773, 847, 872
Cook County IL 60078 Palatine 224
Cook County IL 60082 Techny 224, 847
Cook County IL 60090 Wheeling 224, 847
Cook County IL 60091 Wilmette 224, 847
Cook County IL 60093 Winnetka 224, 847
Cook County IL 60094 Palatine 224
Cook County IL 60095 Palatine 847, 224
Cook County IL 60104 Bellwood 464, 708
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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.