| ZIP Codes: | 18 ZIP Codes (11 Standard, 7 PO Box, 0 Unique) [See All] |
| Area Code: | 406 |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 2:12:52 PM |
| Population: | 113,750 [See All] |
| FIPS: | 30029 |
| CBSA: | Kalispell, MT |
| Land Area: | 4,518 sq mi |
| Water Area: | 173 sq mi |
| Coordinates: | 48.3052, -114.1903 |
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113,750 residents live across 18 ZIPs covering 4,518 sq mi, served by 16 distinct USPS-recognized cities.
Population moved from 94,782 to 113,750 from 2014 to 2024 — a +20.0% change. 9 ZIPs gained residents, 6 lost.
The county's wealthiest ZIP 59922 (Lakeside, $87,237 median) and poorest ZIP 59913 (Coram, $44,464) are 30.6 miles apart — a 2.0× income gap across local geography.
Median home values vary 1.8× across this county — from $437,800 in 59925 (Marion) to $768,600 in 59932 (Somers).
Density varies 32× across the county — from 3 people/sq mi in 59925 (Marion) to 113 in 59901 (Kalispell).
Educational attainment ranges from 15.9% bachelor's+ in 59925 (Marion) to 51.6% in 59937 (Whitefish) — the breadth of educational profiles across the area.
Within Montana, this is the #4 most populous of 56 counties and ranks #21 for median household income with the #6 fastest decade growth .
Weighted by population, the typical household earns about $74,299 across the county — reflecting what a typical resident sees, not a simple ZIP average.
37.7% of adults age 25+ hold a bachelor's degree or higher (30,902 of 82,069 reporting).
11 Standard delivery, 7 PO Box only, 0 single-entity Unique ZIPs serve this county.
Flathead County grew 20.0% over the past decade — concentrated in 2 high-growth ZIPs:
A frontier county — vast land area with only a few residents per square mile. Daily life looks very different here than in the country's denser counties.
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 59901 | Kalispell | Standard | 63,161 | $72,523 | 559.8 | 26.8% |
| 59912 | Columbia Falls | Standard | 15,752 | $76,617 | 168.0 | 11.6% |
| 59937 | Whitefish | Standard | 15,114 | $75,428 | 522.7 | 18.5% |
| 59911 | Bigfork | Standard | 9,493 | $83,019 | 519.9 | 23.7% |
| 59922 | Lakeside | Standard | 2,337 | $87,237 | 60.8 | -8.0% |
| 59932 | Somers | Standard | 1,850 | $60,152 | 25.1 | 15.2% |
| 59920 | Kila | Standard | 1,704 | $86,605 | 189.4 | -12.0% |
| 59925 | Marion | Standard | 1,532 | $63,981 | 440.4 | 10.0% |
| 59936 | West Glacier | PO Box | 690 | $85,455 | 100.5 | 36.1% |
| 59919 | Hungry Horse | PO Box | 679 | $53,056 | 8.6 | -24.4% |
| 59913 | Coram | PO Box | 582 | $44,464 | 54.1 | 1.0% |
| 59927 | Olney | PO Box | 270 | $58,713 | 45.1 | -15.1% |
| 59926 | Martin City | Standard | 268 | $70,948 | 33.5 | -42.7% |
| 59916 | Essex | Standard | 232 | $60,250 | 820.3 | 205.3% |
| 59928 | Polebridge | Standard | 86 | $63,333 | 970.2 | -34.8% |
| 59921 | Lake Mc Donald | PO Box | — | — | 0.0 | — |
| 59903 | Kalispell | PO Box | — | — | 0.0 | — |
| 59904 | Kalispell | PO Box | — | — | 0.0 | — |