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 21773 Myersville Frederick County 227, 240, 301
MD 21774 New Market Frederick County 227, 240, 301
MD 21775 New Midway Frederick County 240
MD 21776 New Windsor Carroll County 227, 240, 301, 410, 443, 667
MD 21777 Point Of Rocks Frederick County 227, 240, 301
MD 21778 Rocky Ridge Frederick County 227, 240, 301, 410, 443, 667
MD 21779 Rohrersville Washington County 227, 240, 301
MD 21780 Sabillasville Frederick County 227, 240, 301
MD 21781 Saint James Washington County 227, 240, 301
MD 21782 Sharpsburg Washington County 227, 240, 301, 304, 681
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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.