There are 14 zip codes in Flathead County, Montana. The most populated is 59901, located in Kalispell. * 2024 populations estimated based on the latest ACS 5-year data.

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Zip Code
City
Population
59901Kalispell60,177
59912Columbia Falls15,381
59937Whitefish14,183
59922Lakeside2,501
59925Marion1,654
59920Kila1,525
59932Somers1,347
59919Hungry Horse891
59913Coram544
59936West Glacier514
59927Olney328
59926Martin City280
59928Polebridge190
59916Essex186

Flathead County, Montana Zip Codes by Population (2024)