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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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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 10551 Mount Vernon 914
Westchester County NY 10552 Mount Vernon 914
Westchester County NY 10553 Mount Vernon 914
Westchester County NY 10557 Mount Vernon 914
Westchester County NY 10558 Mount Vernon 914
Westchester County NY 10560 North Salem 203, 475, 845, 914
Westchester County NY 10562 Ossining 914
Westchester County NY 10566 Peekskill 914
Westchester County NY 10567 Cortlandt Manor 845, 914
Westchester County NY 10570 Pleasantville 914
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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.