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 21213 Baltimore Baltimore city 410, 443, 667
MD 21214 Baltimore Baltimore city 410, 443, 667
MD 21215 Baltimore Baltimore city 410, 443, 667
MD 21216 Baltimore Baltimore city 410, 443, 667
MD 21217 Baltimore Baltimore city 410, 443, 667
MD 21218 Baltimore Baltimore city 410, 443, 667
MD 21219 Sparrows Point Baltimore County 410, 443, 667
MD 21220 Middle River Baltimore County 410, 443, 667
MD 21221 Essex Baltimore County 410, 443, 667
MD 21222 Dundalk Baltimore 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.