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 59912 Columbia Falls Flathead County 406
MT 59913 Coram Flathead County 406
MT 59914 Dayton Lake County 406
MT 59915 Elmo Lake County 406
MT 59916 Essex Flathead County 406
MT 59917 Eureka Lincoln County 236, 250, 406, 672, 778
MT 59918 Fortine Lincoln County 406
MT 59919 Hungry Horse Flathead County 406
MT 59920 Kila Flathead County 406
MT 59921 Lake Mc Donald Flathead 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.