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 21628 Crumpton Queen Anne's County 410, 443, 667
MD 21629 Denton Caroline County 302, 410, 443, 667
MD 21631 East New Market Dorchester County 410, 443, 667
MD 21632 Federalsburg Caroline County 302, 410, 443, 667
MD 21634 Fishing Creek Dorchester County 410, 443, 667
MD 21635 Galena Kent County 302, 410, 443, 667
MD 21636 Goldsboro Caroline County 302, 410, 443, 667
MD 21638 Grasonville Queen Anne's County 410, 443, 667
MD 21639 Greensboro Caroline County 302, 410, 443, 667
MD 21640 Henderson Caroline County 302, 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.