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
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State directory

Maryland ZIP Codes

Complete postal directory, details, and geographic map for the State of Maryland.

State ZIP Code City County Area Codes
MD 21856 Quantico Wicomico County 410, 443, 667
MD 21857 Rehobeth Somerset County 410
MD 21861 Sharptown Wicomico County 302, 410, 443, 667
MD 21862 Showell Worcester County 410, 443, 667
MD 21863 Snow Hill Worcester County 410, 443, 667
MD 21864 Stockton Worcester County 410, 443, 667, 757, 948
MD 21865 Tyaskin Wicomico County 410, 443, 667
MD 21866 Tylerton Somerset County 410, 443, 667
MD 21867 Upper Fairmount Somerset County 410, 443, 667
MD 21869 Vienna Dorchester County 410, 443, 667
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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.