Montana Voting-age Population By County in 2021 (ACS-5Yrs)
Updated on February 28, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, the voting-age population of Montana was 845.16K which was 78.40% of the total Montana population. Among all Montana counties, Yellowstone had the highest voting-age population (125.03K), followed by Missoula (95.40K), and Gallatin (93.62K).
On the other hand, the counties with the least voting-age population were: Petroleum (358), Treasure (576), and Golden Valley (683).
The chart and table below shows the voting-age population of each county and the percentage of each county's population that are of voting-age.
You can see similar information for other states and by state for the United States.
Related Topics: Montana ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates, 2021 Census.
Montana Voting-age Population By County in 2021
Montana Voting-age Population By County in 2021
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| County | Voting-age Population | % of County Population |
|---|---|---|
| Beaverhead | 7780 | 82.85 |
| Big Horn | 8716 | 66.04 |
| Blaine | 4917 | 69.74 |
| Broadwater | 5371 | 80.88 |
| Carbon | 8621 | 82.20 |
| Carter | 1113 | 82.51 |
| Cascade | 65010 | 77.23 |
| Chouteau | 4524 | 76.73 |
| Custer | 9545 | 79.75 |
| Daniels | 1371 | 78.84 |
| Dawson | 7114 | 79.02 |
| Deer Lodge | 8109 | 86.45 |
| Fallon | 2313 | 75.24 |
| Fergus | 9163 | 79.93 |
| Flathead | 80727 | 78.07 |
| Gallatin | 93617 | 80.20 |
| Garfield | 761 | 78.29 |
| Glacier | 9705 | 70.19 |
| Golden Valley | 683 | 83.29 |
| Granite | 2737 | 82.12 |
| Hill | 11719 | 71.91 |
| Jefferson | 9587 | 79.51 |
| Judith Basin | 1534 | 76.55 |
| Lake | 23777 | 76.63 |
| Lewis and Clark | 55171 | 78.44 |
| Liberty | 1496 | 73.84 |
| Lincoln | 16061 | 81.64 |
| McCone | 1464 | 81.11 |
| Madison | 7173 | 84.40 |
| Meagher | 1594 | 82.51 |
| Mineral | 3621 | 80.65 |
| Missoula | 95397 | 81.27 |
| Musselshell | 3896 | 80.95 |
| Park | 14136 | 82.80 |
| Petroleum | 358 | 82.49 |
| Phillips | 3229 | 76.28 |
| Pondera | 4561 | 76.35 |
| Powder River | 1400 | 79.59 |
| Powell | 5902 | 84.86 |
| Prairie | 937 | 76.36 |
| Ravalli | 35428 | 80.90 |
| Richland | 8472 | 74.48 |
| Roosevelt | 7177 | 65.94 |
| Rosebud | 6096 | 72.02 |
| Sanders | 10134 | 82.40 |
| Sheridan | 2794 | 79.33 |
| Silver Bow | 27789 | 79.36 |
| Stillwater | 6994 | 78.44 |
| Sweet Grass | 2935 | 79.54 |
| Teton | 4645 | 75.25 |
| Toole | 4003 | 79.85 |
| Treasure | 576 | 83.12 |
| Valley | 5781 | 76.54 |
| Wheatland | 1648 | 79.16 |
| Wibaux | 751 | 73.77 |
| Yellowstone | 125030 | 76.43 |