Population in Montana by County
Total population.
U.S. Census Bureau · ACS 5-year 2020-2024 · Updated November 2026
Montana
1,116,875
Counties
56
Highest
Yellowstone
168,957
Lowest
Petroleum
447
All Montana counties, ranked
| # | Counties | Population |
|---|---|---|
| 1 | Yellowstone | 168,957 |
| 2 | Gallatin | 124,074 |
| 3 | Missoula | 120,672 |
| 4 | Flathead | 110,695 |
| 5 | Cascade | 84,606 |
| 6 | Lewis and Clark | 73,464 |
| 7 | Ravalli | 46,727 |
| 8 | Silver Bow | 35,785 |
| 9 | Lake | 32,561 |
| 10 | Lincoln | 21,175 |
| 11 | Park | 17,710 |
| 12 | Hill | 16,155 |
| 13 | Glacier | 13,637 |
| 14 | Sanders | 13,285 |
| 15 | Big Horn | 12,891 |
| 16 | Jefferson | 12,774 |
| 17 | Custer | 11,961 |
| 18 | Fergus | 11,687 |
| 19 | Richland | 11,235 |
| 20 | Carbon | 11,116 |
| 21 | Roosevelt | 10,526 |
| 22 | Beaverhead | 9,713 |
| 23 | Deer Lodge | 9,597 |
| 24 | Madison | 9,223 |
| 25 | Stillwater | 9,182 |
| 26 | Dawson | 8,827 |
| 27 | Rosebud | 8,165 |
| 28 | Broadwater | 7,668 |
| 29 | Valley | 7,519 |
| 30 | Powell | 7,053 |
| 31 | Blaine | 6,949 |
| 32 | Teton | 6,353 |
| 33 | Pondera | 6,035 |
| 34 | Chouteau | 5,906 |
| 35 | Musselshell | 5,152 |
| 36 | Toole | 5,061 |
| 37 | Mineral | 4,959 |
| 38 | Phillips | 4,221 |
| 39 | Sweet Grass | 3,720 |
| 40 | Sheridan | 3,669 |
| 41 | Granite | 3,462 |
| 42 | Fallon | 2,760 |
| 43 | Judith Basin | 2,071 |
| 44 | Wheatland | 2,056 |
| 45 | Meagher | 2,007 |
| 46 | Liberty | 1,952 |
| 47 | Powder River | 1,815 |
| 48 | McCone | 1,670 |
| 49 | Daniels | 1,494 |
| 50 | Carter | 1,308 |
| 51 | Prairie | 1,250 |
| 52 | Wibaux | 1,193 |
| 53 | Garfield | 1,094 |
| 54 | Golden Valley | 899 |
| 55 | Treasure | 732 |
| 56 | Petroleum | 447 |
About this dataset
Total population. Source: ACS 5-year 2020-2024 Data Profile, variable DP05_0001E. Values in people.
- Source
- U.S. Census Bureau
- Citation
- U.S. Census Bureau, American Community Survey 5-Year Estimates Data Profiles (2020-2024), DP05_0001E
- Vintage
- ACS 5-year 2020-2024
- Unit
- people
- Available at
- State · County · ZIP code
- Territory roll-up
- Summed across each territory
- Last loaded
- November 2026
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