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 21203 Baltimore Baltimore City 410
MD 21204 Towson Baltimore County 410, 443, 667
MD 21205 Baltimore Baltimore city 410, 443, 667
MD 21206 Baltimore Baltimore city 410, 443, 667
MD 21207 Gwynn Oak Baltimore County 410, 443, 667
MD 21208 Pikesville Baltimore County 410, 443, 667
MD 21209 Baltimore Baltimore County 410, 443, 667
MD 21210 Baltimore Baltimore city 410, 443, 667
MD 21211 Baltimore Baltimore city 410, 443, 667
MD 21212 Baltimore Baltimore city 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.