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

Chester County ZIP Codes

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

County State ZIP Code City Area Codes
Westchester County NY 10505 Baldwin Place 845, 914
Westchester County NY 10506 Bedford 203, 475, 914
Westchester County NY 10507 Bedford Hills 914
Westchester County NY 10510 Briarcliff Manor 914
Westchester County NY 10511 Buchanan 914
Westchester County NY 10514 Chappaqua 914
Westchester County NY 10517 Crompond 914
Westchester County NY 10518 Cross River 914
Westchester County NY 10519 Croton Falls 845, 914
Westchester County NY 10520 Croton On Hudson 914
Page 3 of 19

Geographic Map of Chester 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.