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
All states and U.S. territories
Maps and coordinates
County directory

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 60466 Park Forest 464, 708
Cook County IL 60467 Orland Park 464, 708
Cook County IL 60469 Posen 464, 708
Cook County IL 60471 Richton Park 464, 708
Cook County IL 60472 Robbins 464, 708
Cook County IL 60473 South Holland 464, 708
Cook County IL 60476 Thornton 464, 708
Cook County IL 60477 Tinley Park 464, 708, 779, 815
Cook County IL 60478 Country Club Hills 464, 708
Cook County IL 60480 Willow Springs 331, 464, 630, 708
Page 12 of 24

Geographic Map of Cook County

Postal context

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.