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.

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Washington County ZIP Codes

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

County State ZIP Code City Area Codes
Washington County MD 21749 Hagerstown 240
Washington County MD 21750 Hancock 223, 227, 240, 301, 304, 681, 717
Washington County MD 21756 Keedysville 227, 240, 301
Washington County MD 21767 Maugansville 227, 240, 301
Washington County MD 21779 Rohrersville 227, 240, 301
Washington County MD 21781 Saint James 227, 240, 301
Washington County MD 21782 Sharpsburg 227, 240, 301, 304, 681
Washington County MD 21783 Smithsburg 223, 227, 240, 301, 717
Washington County MD 21795 Williamsport 227, 240, 301, 304, 681
Washington County ME 04413 Brookton 207, 506
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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.