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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 10521 Croton On Hudson 914
Westchester County NY 10522 Dobbs Ferry 914
Westchester County NY 10523 Elmsford 914
Westchester County NY 10526 Goldens Bridge 914
Westchester County NY 10527 Granite Springs 914
Westchester County NY 10528 Harrison 914
Westchester County NY 10530 Hartsdale 914
Westchester County NY 10532 Hawthorne 914
Westchester County NY 10533 Irvington 914
Westchester County NY 10535 Jefferson Valley 845, 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.