Montana Citizen Voting-age Population By County in 2020 (ACS-5Yrs)
Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2020, the citizen voting-age population for Montana was 823,795 and represented 77.59% of the total Montana population.
Among all Montana counties, Yellowstone had the highest citizen voting-age population (121.53K), followed by Missoula (95.25K), and Gallatin (87.65K).
In terms of percentages, Treasure had the highest percentage of its population being citizens of voting-age (88.62%), followed by Powell (86.12%), and Deer Lodge (85.09%).
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 | 121525 | 75.77 |
| Missoula | 95250 | 80.00 |
| Gallatin | 87645 | 78.68 |
| Flathead | 78940 | 77.39 |
| Cascade | 62730 | 76.90 |
| Lewis and Clark | 53575 | 77.97 |
| Ravalli | 34955 | 80.50 |
| Silver Bow | 27470 | 78.72 |
| Lake | 22895 | 75.35 |
| Lincoln | 16030 | 80.78 |
| Park | 13490 | 81.68 |
| Hill | 11770 | 71.68 |
| Sanders | 9650 | 81.75 |
| Jefferson | 9450 | 78.29 |
| Glacier | 9300 | 67.86 |
| Custer | 9075 | 78.47 |
| Big Horn | 8775 | 65.98 |
| Fergus | 8755 | 78.42 |
| Carbon | 8745 | 81.81 |
| Richland | 8100 | 73.01 |
| Deer Lodge | 7790 | 85.09 |
| Beaverhead | 7785 | 82.34 |
| Stillwater | 7475 | 78.19 |
| Roosevelt | 7305 | 65.87 |
| Madison | 7015 | 82.24 |
| Dawson | 6940 | 78.64 |
| Rosebud | 6470 | 71.37 |
| Powell | 5895 | 86.12 |
| Valley | 5730 | 77.17 |
| Broadwater | 4855 | 79.85 |
| Blaine | 4675 | 69.78 |
| Teton | 4615 | 75.35 |
| Pondera | 4430 | 74.96 |
| Chouteau | 4390 | 76.61 |
| Toole | 3865 | 80.35 |
| Musselshell | 3715 | 79.38 |
| Mineral | 3500 | 80.83 |
| Phillips | 3030 | 75.19 |
| Sweet Grass | 2900 | 78.91 |
| Granite | 2730 | 82.11 |
| Sheridan | 2630 | 77.58 |
| Fallon | 2145 | 72.10 |
| Liberty | 1905 | 77.60 |
| Wheatland | 1690 | 78.97 |
| Judith Basin | 1540 | 78.17 |
| McCone | 1435 | 78.63 |
| Meagher | 1430 | 79.67 |
| Powder River | 1360 | 83.18 |
| Daniels | 1340 | 78.59 |
| Carter | 1050 | 80.46 |
| Prairie | 860 | 74.14 |
| Garfield | 815 | 77.62 |
| Wibaux | 770 | 74.40 |
| Golden Valley | 670 | 82.21 |
| Treasure | 545 | 88.62 |
| Petroleum | 380 | 81.72 |
