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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State directory

Montana ZIP Codes

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

State ZIP Code City County Area Codes
MT 59635 East Helena Lewis and Clark County 406
MT 59636 Fort Harrison Lewis and Clark County 406
MT 59638 Jefferson City Jefferson County 406
MT 59639 Lincoln Lewis and Clark County 406
MT 59640 Marysville Lewis and Clark County 406
MT 59641 Radersburg Broadwater County 406
MT 59642 Ringling Meagher County 406
MT 59643 Toston Broadwater County 406
MT 59644 Townsend Broadwater County 406
MT 59645 White Sulphur Springs Meagher County 406
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Geographic Map of Montana

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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.