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 59013 Boyd Carbon County 406
MT 59014 Bridger Carbon County 307, 406
MT 59015 Broadview Yellowstone County 406
MT 59016 Busby Big Horn County 406
MT 59018 Clyde Park Park County 406
MT 59019 Columbus Stillwater County 406
MT 59020 Cooke City Park County 307, 406
MT 59022 Crow Agency Big Horn County 406
MT 59024 Custer Yellowstone County 406
MT 59025 Decker Big Horn County 307, 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.