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 21641 Hillsboro Caroline County 410, 443, 667
MD 21643 Hurlock Dorchester County 410, 443, 667
MD 21644 Ingleside Queen Anne's County 410, 443, 667
MD 21645 Kennedyville Kent County 410, 443, 667
MD 21647 Mcdaniel Talbot County 410, 443, 667
MD 21648 Madison Dorchester County 410, 443, 667
MD 21649 Marydel Caroline County 302, 410, 443, 667
MD 21650 Massey Kent County 410, 443, 667
MD 21651 Millington Kent County 302, 410, 443, 667
MD 21652 Neavitt Talbot County 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.