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 20670 Patuxent River St. Mary's County 227, 240, 301, 410, 443, 667
MD 20674 Piney Point St. Mary's County 227, 240, 301
MD 20675 Pomfret Charles County 227, 240, 301
MD 20676 Port Republic Calvert County 410, 443, 667
MD 20677 Port Tobacco Charles County 227, 240, 301
MD 20678 Prince Frederick Calvert County 227, 240, 301, 410, 443, 667
MD 20680 Ridge St. Mary's County 227, 240, 301
MD 20682 Rock Point Charles County 240
MD 20684 Saint Inigoes St. Mary's County 227, 240, 301
MD 20685 Saint Leonard Calvert County 227, 240, 301, 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.