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 20686 Saint Marys City St. Mary's County 227, 240, 301
MD 20687 Scotland St. Mary's County 227, 240, 301
MD 20688 Solomons Calvert County 227, 240, 301, 410, 443, 667
MD 20689 Sunderland Calvert County 410, 443, 667
MD 20690 Tall Timbers St. Mary's County 227, 240, 301
MD 20692 Valley Lee St. Mary's County 227, 240, 301
MD 20693 Welcome Charles County 227, 240, 301
MD 20695 White Plains Charles County 227, 240, 301
MD 20697 Southern Md Facility Prince George's County 240
MD 20701 Annapolis Junction Anne Arundel County 227, 240, 301, 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.