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
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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 21053 Freeland Baltimore County 223, 410, 443, 667, 717
MD 21054 Gambrills Anne Arundel County 227, 240, 301, 410, 443, 667
MD 21056 Gibson Island Anne Arundel County 410, 443, 667
MD 21057 Glen Arm Baltimore County 410, 443, 667
MD 21060 Glen Burnie Anne Arundel County 410, 443, 667
MD 21061 Glen Burnie Anne Arundel County 410, 443, 667
MD 21062 Glen Burnie Anne Arundel County 410
MD 21065 Hunt Valley Baltimore County 410
MD 21071 Glyndon Baltimore County 410, 443, 667
MD 21074 Hampstead Carroll County 410, 443, 667
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Geographic Map of Maryland

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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.