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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 20915 Silver Spring 240
Montgomery County MD 20916 Silver Spring 240
Montgomery County MD 20918 Silver Spring 240
Montgomery County MD 20993 Silver Spring 240
Montgomery County MD 20997 Silver Spring 240
Montgomery County MO 63333 Bellflower 573, 636
Montgomery County MO 63350 High Hill 573, 636
Montgomery County MO 63351 Jonesburg 636
Montgomery County MO 63359 Middletown 573
Montgomery County MO 63361 Montgomery City 573, 636
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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.