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 21871 Westover Somerset County 410, 443, 667
MD 21872 Whaleyville Worcester County 302, 410, 443, 667
MD 21874 Willards Wicomico County 302, 410, 443, 667
MD 21875 Delmar Wicomico County 302, 410, 443, 667
MD 21890 Westover Somerset County 410, 443, 667
MD 21901 North East Cecil County 410, 443, 667
MD 21902 Perry Point Cecil County 410, 443, 667
MD 21903 Perryville Cecil County 410, 443, 667
MD 21904 Port Deposit Cecil County 410, 443, 667
MD 21911 Rising Sun Cecil County 223, 410, 443, 484, 610, 667, 717, 835
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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.