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 59301 Miles City Custer County 406
MT 59311 Alzada Carter County 307, 406
MT 59312 Angela Garfield County 406
MT 59313 Baker Fallon County 306, 406, 474, 701
MT 59314 Biddle Powder River County 307, 406
MT 59315 Bloomfield Dawson County 406
MT 59316 Boyes Carter County 406
MT 59317 Broadus Powder River County 307, 406
MT 59318 Brusett Garfield County 406
MT 59319 Capitol Carter County 406, 605
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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.