Montana Citizen Population By County in 2021 (ACS-5Yrs)
Updated on March 28, 2026.
Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2021, the citizen population for Montana was 1,067,750 and represented 99.05% of the total Montana population.
Among all Montana counties, Yellowstone had the highest citizen population (162.24K), followed by Missoula (115.85K), and Gallatin (114.73K).
In terms of percentages, Garfield had the highest percentage of its population being citizens (100.00%), followed by Golden Valley (100.00%), and Liberty (100.00%).
The chart and table below shows the citizen population of each county and the percentage of each county's population that were citizens.
You can see similar information for other states and by state for the United States.
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Data Source: US Census - ACS 5-Year (CVAP).
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Montana Citizen Population By County in 2021
Montana Citizen Population By County in 2021
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| County | Citizen Population | % of County Population |
|---|---|---|
| Yellowstone | 162235 | 99.17 |
| Missoula | 115845 | 98.69 |
| Gallatin | 114730 | 98.29 |
| Flathead | 102395 | 99.03 |
| Cascade | 83625 | 99.34 |
| Lewis and Clark | 69965 | 99.47 |
| Ravalli | 43595 | 99.56 |
| Silver Bow | 34750 | 99.24 |
| Lake | 30670 | 98.84 |
| Lincoln | 19390 | 98.55 |
| Park | 16910 | 99.06 |
| Hill | 16175 | 99.26 |
| Glacier | 13680 | 98.95 |
| Big Horn | 13175 | 99.81 |
| Sanders | 12215 | 99.31 |
| Jefferson | 11990 | 99.46 |
| Custer | 11910 | 99.50 |
| Fergus | 11415 | 99.56 |
| Richland | 11110 | 97.67 |
| Roosevelt | 10825 | 99.45 |
| Carbon | 10450 | 99.62 |
| Deer Lodge | 9245 | 98.56 |
| Beaverhead | 9235 | 98.35 |
| Dawson | 8955 | 99.45 |
| Stillwater | 8880 | 99.61 |
| Madison | 8410 | 98.94 |
| Rosebud | 8390 | 99.11 |
| Valley | 7535 | 99.74 |
| Blaine | 7020 | 99.57 |
| Powell | 6930 | 99.64 |
| Broadwater | 6575 | 99.02 |
| Teton | 6160 | 99.76 |
| Pondera | 5880 | 98.41 |
| Chouteau | 5875 | 99.66 |
| Toole | 4975 | 99.20 |
| Musselshell | 4755 | 98.75 |
| Mineral | 4470 | 99.56 |
| Phillips | 4165 | 98.35 |
| Sweet Grass | 3685 | 99.86 |
| Sheridan | 3485 | 99.01 |
| Granite | 3300 | 98.95 |
| Fallon | 3055 | 99.35 |
| Wheatland | 2080 | 100.00 |
| Liberty | 2025 | 100.00 |
| Judith Basin | 1985 | 99.00 |
| Meagher | 1910 | 98.96 |
| McCone | 1780 | 98.62 |
| Daniels | 1735 | 99.71 |
| Powder River | 1735 | 98.58 |
| Carter | 1345 | 99.63 |
| Prairie | 1190 | 97.14 |
| Wibaux | 1000 | 98.04 |
| Garfield | 970 | 100.00 |
| Golden Valley | 820 | 100.00 |
| Treasure | 695 | 100.00 |
| Petroleum | 435 | 100.00 |
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