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 21741 Hagerstown Washington County 240
MD 21742 Hagerstown Washington County 223, 227, 240, 301, 717
MD 21746 Hagerstown Washington County 227, 240, 301
MD 21747 Hagerstown Washington County 240
MD 21748 Hagerstown Washington County 240
MD 21749 Hagerstown Washington County 240
MD 21750 Hancock Washington County 223, 227, 240, 301, 304, 681, 717
MD 21754 Ijamsville Frederick County 227, 240, 301
MD 21755 Jefferson Frederick County 227, 240, 301, 540, 571, 703, 826
MD 21756 Keedysville Washington 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.