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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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 20611 Bel Alton Charles County 227, 240, 301
MD 20612 Benedict Charles County 227, 240, 301, 410, 443, 667
MD 20613 Brandywine Prince George's County 227, 240, 301, 410, 443, 667
MD 20615 Broomes Island Calvert County 410, 443, 667
MD 20616 Bryans Road Charles County 227, 240, 301
MD 20617 Bryantown Charles County 227, 240, 301
MD 20618 Bushwood St. Mary's County 227, 240, 301
MD 20619 California St. Mary's County 227, 240, 301, 410, 443, 667
MD 20620 Callaway St. Mary's County 227, 240, 301
MD 20621 Chaptico St. Mary's County 227, 240, 301
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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.