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 20588 Dhs Howard County 410
MD 20601 Waldorf Charles County 227, 240, 301
MD 20602 Waldorf Charles County 227, 240, 301
MD 20603 Waldorf Charles County 227, 240, 301
MD 20604 Waldorf Charles County 240
MD 20606 Abell St. Mary's County 227, 240, 301
MD 20607 Accokeek Prince George's County 227, 240, 301
MD 20608 Aquasco Prince George's County 227, 240, 301, 410, 443, 667
MD 20609 Avenue St. Mary's County 227, 240, 301
MD 20610 Barstow Calvert County 410
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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.