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.

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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 59001 Absarokee Stillwater County 406
MT 59002 Acton Yellowstone County 406
MT 59003 Ashland Rosebud County 406
MT 59004 Ashland Rosebud County 406
MT 59006 Ballantine Yellowstone County 406
MT 59007 Bearcreek Carbon County 406
MT 59008 Belfry Carbon County 307, 406
MT 59010 Bighorn Treasure County 406
MT 59011 Big Timber Sweet Grass County 406
MT 59012 Birney Rosebud County 406
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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.