Montana Citizen Population By County in 2017 (ACS-5Yrs)
Updated on March 28, 2026.
Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2017, the citizen population for Montana was 1,019,465 and represented 98.99% of the total Montana population.
Among all Montana counties, Yellowstone had the highest citizen population (154.79K), followed by Missoula (112.73K), and Gallatin (98.89K).
In terms of percentages, Carter had the highest percentage of its population being citizens (100.00%), followed by Garfield (100.00%), and Golden Valley (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 2017
Montana Citizen Population By County in 2017
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| County | Citizen Population | % of County Population |
|---|---|---|
| Yellowstone | 154785 | 99.01 |
| Missoula | 112730 | 98.69 |
| Gallatin | 98885 | 98.16 |
| Flathead | 95495 | 99.32 |
| Cascade | 81110 | 99.14 |
| Lewis and Clark | 65950 | 99.49 |
| Ravalli | 41195 | 99.54 |
| Silver Bow | 34020 | 98.57 |
| Lake | 29200 | 98.92 |
| Lincoln | 19065 | 99.04 |
| Hill | 16340 | 99.21 |
| Park | 15825 | 98.91 |
| Glacier | 13500 | 98.72 |
| Big Horn | 13210 | 99.40 |
| Custer | 11815 | 99.33 |
| Jefferson | 11535 | 99.23 |
| Sanders | 11320 | 99.17 |
| Richland | 11245 | 98.60 |
| Fergus | 11175 | 98.68 |
| Roosevelt | 11125 | 99.15 |
| Carbon | 10425 | 99.62 |
| Stillwater | 9250 | 99.04 |
| Rosebud | 9215 | 99.19 |
| Dawson | 9210 | 98.77 |
| Beaverhead | 9115 | 97.38 |
| Deer Lodge | 9110 | 99.78 |
| Madison | 7710 | 97.60 |
| Valley | 7500 | 99.21 |
| Powell | 6845 | 99.93 |
| Blaine | 6620 | 99.62 |
| Teton | 6020 | 99.67 |
| Pondera | 6015 | 98.93 |
| Chouteau | 5765 | 99.23 |
| Broadwater | 5735 | 99.65 |
| Toole | 4985 | 99.11 |
| Musselshell | 4725 | 99.16 |
| Mineral | 4195 | 100.00 |
| Phillips | 4135 | 99.88 |
| Sweet Grass | 3610 | 99.04 |
| Sheridan | 3530 | 98.88 |
| Granite | 3170 | 98.91 |
| Fallon | 2900 | 99.15 |
| Liberty | 2245 | 100.00 |
| Wheatland | 2065 | 97.87 |
| Meagher | 1985 | 99.25 |
| Judith Basin | 1960 | 99.75 |
| Daniels | 1775 | 99.16 |
| McCone | 1715 | 99.13 |
| Powder River | 1590 | 98.76 |
| Prairie | 1325 | 100.00 |
| Carter | 1320 | 100.00 |
| Wibaux | 1100 | 98.21 |
| Garfield | 1085 | 100.00 |
| Treasure | 790 | 100.00 |
| Golden Valley | 745 | 100.00 |
| Petroleum | 455 | 100.00 |
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