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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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Flathead County ZIP Codes

Browse all ZIP Codes, cities, and associated area codes registered in Flathead County.

County State ZIP Code City Area Codes
Flathead County MT 59901 Kalispell 406
Flathead County MT 59903 Kalispell 406
Flathead County MT 59904 Kalispell 406
Flathead County MT 59911 Bigfork 406
Flathead County MT 59912 Columbia Falls 406
Flathead County MT 59913 Coram 406
Flathead County MT 59916 Essex 406
Flathead County MT 59919 Hungry Horse 406
Flathead County MT 59920 Kila 406
Flathead County MT 59921 Lake Mc Donald 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.