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 21538 Kitzmiller Garrett County 227, 240, 301, 304, 681
MD 21539 Lonaconing Allegany County 227, 240, 301
MD 21540 Luke Allegany County 227, 240, 301, 304, 681
MD 21541 Mc Henry Garrett County 227, 240, 301
MD 21542 Midland Allegany County 227, 240, 301
MD 21543 Midlothian Allegany County 227, 240, 301
MD 21545 Mount Savage Allegany County 227, 240, 301, 582, 814
MD 21550 Oakland Garrett County 227, 240, 301, 304, 681
MD 21555 Oldtown Allegany County 227, 240, 301, 304, 681
MD 21556 Pinto Allegany County 240
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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.