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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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 60482 Worth 464, 708
Cook County IL 60487 Tinley Park 464, 708, 779, 815
Cook County IL 60499 Bedford Park 464, 708
Cook County IL 60501 Summit Argo 464, 708, 773, 872
Cook County IL 60513 Brookfield 464, 708
Cook County IL 60525 La Grange 331, 464, 630, 708
Cook County IL 60526 La Grange Park 331, 464, 630, 708
Cook County IL 60534 Lyons 464, 708
Cook County IL 60546 Riverside 464, 708
Cook County IL 60558 Western Springs 331, 464, 630, 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.