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
Dorchester County MD 21669 Taylors Island 410, 443, 667
Dorchester County MD 21672 Toddville 410, 443, 667
Dorchester County MD 21675 Wingate 410, 443, 667
Dorchester County MD 21677 Woolford 410, 443, 667
Dorchester County MD 21835 Linkwood 410, 443, 667
Dorchester County MD 21869 Vienna 410, 443, 667
Westchester County NY 10501 Amawalk 914
Westchester County NY 10502 Ardsley 914
Westchester County NY 10503 Ardsley On Hudson 914
Westchester County NY 10504 Armonk 203, 475, 914
Page 2 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.