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 21797 Woodbine Howard County 227, 240, 301, 410, 443, 667
MD 21798 Woodsboro Frederick County 227, 240, 301
MD 21801 Salisbury Wicomico County 302, 410, 443, 667
MD 21802 Salisbury Wicomico County 410
MD 21803 Salisbury Wicomico County 410
MD 21804 Salisbury Wicomico County 410, 443, 667
MD 21810 Allen Wicomico County 410, 443, 667
MD 21811 Berlin Worcester County 410, 443, 667
MD 21813 Bishopville Worcester County 302, 410, 443, 667
MD 21814 Bivalve Wicomico County 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.