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 59484 Sweet Grass Toole County 368, 403, 406, 587, 825
MT 59485 Ulm Cascade County 406
MT 59486 Valier Pondera County 406
MT 59487 Vaughn Cascade County 406
MT 59489 Winifred Fergus County 406
MT 59501 Havre Hill County 306, 368, 403, 406, 474, 587, 639, 825
MT 59520 Big Sandy Chouteau County 406
MT 59521 Box Elder Hill County 406
MT 59522 Chester Liberty County 368, 403, 406, 587, 825
MT 59523 Chinook Blaine County 306, 368, 406, 474, 587, 639
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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.