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 20812 Glen Echo Montgomery County 227, 240, 301, 571, 703
MD 20813 Bethesda Montgomery County 240
MD 20814 Bethesda Montgomery County 227, 240, 301
MD 20815 Chevy Chase Montgomery County 202, 227, 240, 301, 771
MD 20816 Bethesda Montgomery County 202, 227, 240, 301, 571, 703, 771
MD 20817 Bethesda Montgomery County 227, 240, 301
MD 20818 Cabin John Montgomery County 227, 240, 301, 571, 703
MD 20824 Bethesda Montgomery County 240
MD 20825 Chevy Chase Montgomery County 240
MD 20827 Bethesda Montgomery County 240
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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.