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
Population
City
5990160,177Kalispell
5991215,381Columbia Falls
5993714,183Whitefish
599222,501Lakeside
599251,654Marion
599201,525Kila
599321,347Somers
59919891Hungry Horse
59913544Coram
59936514West Glacier
59927328Olney
59926280Martin City
59928190Polebridge
59916186Essex

Zip Codes in Flathead County, Montana by Population (2024)