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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.

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Montgomery County ZIP Codes

Browse all ZIP Codes, cities, and associated area codes registered in Montgomery County.

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