There are 15 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
599119,161Bigfork
599222,501Lakeside
599251,654Marion
599201,525Kila
599321,347Somers
59919891Hungry Horse
59913544Coram
59936514West Glacier
59927328Olney
59926280Martin City
59928190Polebridge
59916186Essex
showing: 15 rows

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