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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Maryland ZIP Codes

Complete postal directory, details, and geographic map for the State of Maryland.

State ZIP Code City County Area Codes
MD 21521 Barton Allegany County 227, 240, 301
MD 21522 Bittinger Garrett County 301
MD 21523 Bloomington Garrett County 227, 240, 301, 304, 681
MD 21524 Corriganville Allegany County 227, 240, 301, 582, 814
MD 21528 Eckhart Mines Allegany County 240
MD 21529 Ellerslie Allegany County 227, 240, 301, 582, 814
MD 21530 Flintstone Allegany County 227, 240, 301, 582, 814
MD 21531 Friendsville Garrett County 227, 240, 301, 304, 582, 681, 724, 814, 878
MD 21532 Frostburg Allegany County 227, 240, 301, 582, 814
MD 21536 Grantsville Garrett County 227, 240, 301, 582, 814
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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.