Montana Citizen Voting-age Population By County in 2021 (ACS-5Yrs)
Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2021, the citizen voting-age population for Montana was 835,505 and represented 77.51% of the total Montana population.
Among all Montana counties, Yellowstone had the highest citizen voting-age population (123.71K), followed by Missoula (93.87K), and Gallatin (91.78K).
In terms of percentages, Deer Lodge had the highest percentage of its population being citizens of voting-age (85.13%), followed by Powell (84.54%), and Golden Valley (83.54%).
The chart and table below shows the citizen voting-age population of each county and the percentage of each county's population that were citizens of voting-age.
You can see similar information for other states and by state for the United States.
| County | Citizen Voting-age Population | % of County Population |
|---|---|---|
| Yellowstone | 123705 | 75.62 |
| Missoula | 93865 | 79.97 |
| Gallatin | 91775 | 78.63 |
| Flathead | 79795 | 77.17 |
| Cascade | 64505 | 76.63 |
| Lewis and Clark | 54810 | 77.92 |
| Ravalli | 35250 | 80.50 |
| Silver Bow | 27520 | 78.60 |
| Lake | 23420 | 75.47 |
| Lincoln | 15850 | 80.56 |
| Park | 13975 | 81.87 |
| Hill | 11595 | 71.16 |
| Sanders | 10050 | 81.71 |
| Glacier | 9600 | 69.44 |
| Jefferson | 9520 | 78.97 |
| Custer | 9490 | 79.28 |
| Fergus | 9115 | 79.50 |
| Big Horn | 8695 | 65.87 |
| Carbon | 8585 | 81.84 |
| Richland | 8265 | 72.66 |
| Deer Lodge | 7985 | 85.13 |
| Beaverhead | 7640 | 81.36 |
| Roosevelt | 7125 | 65.46 |
| Madison | 7090 | 83.41 |
| Dawson | 7065 | 78.46 |
| Stillwater | 6960 | 78.07 |
| Rosebud | 6020 | 71.12 |
| Powell | 5880 | 84.54 |
| Valley | 5765 | 76.31 |
| Broadwater | 5305 | 79.90 |
| Blaine | 4885 | 69.29 |
| Teton | 4635 | 75.06 |
| Chouteau | 4505 | 76.42 |
| Pondera | 4470 | 74.81 |
| Toole | 3965 | 79.06 |
| Musselshell | 3835 | 79.65 |
| Mineral | 3605 | 80.29 |
| Phillips | 3160 | 74.62 |
| Sweet Grass | 2930 | 79.40 |
| Sheridan | 2760 | 78.41 |
| Granite | 2705 | 81.11 |
| Fallon | 2295 | 74.63 |
| Wheatland | 1650 | 79.33 |
| Meagher | 1570 | 81.35 |
| Judith Basin | 1515 | 75.56 |
| Liberty | 1495 | 73.83 |
| McCone | 1440 | 79.78 |
| Powder River | 1380 | 78.41 |
| Daniels | 1365 | 78.45 |
| Carter | 1110 | 82.22 |
| Prairie | 900 | 73.47 |
| Garfield | 760 | 78.35 |
| Wibaux | 745 | 73.04 |
| Golden Valley | 685 | 83.54 |
| Treasure | 575 | 82.73 |
| Petroleum | 360 | 82.76 |
