Montana Citizen Voting-age Population By County in 2018 (ACS-5Yrs)
Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2018, the citizen voting-age population for Montana was 804,265 and represented 77.21% of the total Montana population.
Among all Montana counties, Yellowstone had the highest citizen voting-age population (119.26K), followed by Missoula (92.09K), and Gallatin (81.66K).
In terms of percentages, Powell had the highest percentage of its population being citizens of voting-age (85.20%), followed by Deer Lodge (83.63%), and Powder River (83.33%).
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 | 119255 | 75.57 |
| Missoula | 92090 | 79.40 |
| Gallatin | 81655 | 77.97 |
| Flathead | 75685 | 77.17 |
| Cascade | 62790 | 76.81 |
| Lewis and Clark | 52140 | 77.73 |
| Ravalli | 33380 | 79.67 |
| Silver Bow | 27295 | 78.40 |
| Lake | 22325 | 74.98 |
| Lincoln | 15640 | 80.79 |
| Park | 13070 | 80.46 |
| Hill | 11800 | 71.78 |
| Sanders | 9355 | 81.21 |
| Jefferson | 9280 | 78.78 |
| Glacier | 9245 | 67.48 |
| Custer | 9180 | 77.50 |
| Fergus | 8900 | 78.94 |
| Big Horn | 8760 | 65.50 |
| Carbon | 8595 | 81.51 |
| Richland | 8455 | 74.43 |
| Deer Lodge | 7610 | 83.63 |
| Beaverhead | 7520 | 80.04 |
| Roosevelt | 7455 | 66.39 |
| Stillwater | 7290 | 77.47 |
| Dawson | 7155 | 77.86 |
| Madison | 6640 | 80.78 |
| Rosebud | 6470 | 69.95 |
| Powell | 5845 | 85.20 |
| Valley | 5830 | 77.42 |
| Blaine | 4715 | 70.11 |
| Broadwater | 4655 | 79.78 |
| Teton | 4615 | 75.91 |
| Pondera | 4480 | 74.11 |
| Chouteau | 4370 | 75.47 |
| Toole | 3985 | 80.10 |
| Musselshell | 3790 | 78.88 |
| Mineral | 3450 | 81.95 |
| Phillips | 3130 | 75.88 |
| Sweet Grass | 2870 | 78.52 |
| Sheridan | 2780 | 77.76 |
| Granite | 2680 | 81.96 |
| Fallon | 2125 | 74.82 |
| Liberty | 1785 | 78.29 |
| Judith Basin | 1595 | 81.80 |
| Wheatland | 1585 | 73.72 |
| Meagher | 1560 | 79.19 |
| Daniels | 1380 | 78.63 |
| Powder River | 1350 | 83.33 |
| McCone | 1290 | 79.14 |
| Carter | 1060 | 80.30 |
| Prairie | 1015 | 75.75 |
| Garfield | 900 | 78.95 |
| Wibaux | 820 | 69.79 |
| Treasure | 625 | 80.65 |
| Golden Valley | 595 | 82.07 |
| Petroleum | 345 | 80.23 |
