Montana Citizen Population By County in 2012 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2012, the citizen population for Montana was 981,665 and represented 99.08% of the total Montana population.

Among all Montana counties, Yellowstone had the highest citizen population (147.19K), followed by Missoula (108.05K), and Flathead (89.74K).

In terms of percentages, Carter had the highest percentage of its population being citizens (100.00%), followed by Fallon (100.00%), and Garfield (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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Montana Citizen Voting-age Population By County in 2012

Data Source: US Census - ACS 5-Year (CVAP).

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Montana Citizen Population By County in 2012

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County	Citizen Population	% of County Population
Yellowstone	147190	99.33
Missoula	108050	98.77
Flathead	89740	98.65
Gallatin	88790	98.28
Cascade	80645	99.26
Lewis and Clark	62910	99.18
Ravalli	39945	99.10
Silver Bow	33840	99.05
Lake	28560	99.18
Lincoln	19445	99.23
Hill	16010	99.10
Park	15525	99.17
Glacier	13290	99.03
Big Horn	12830	99.69
Custer	11645	99.49
Fergus	11425	99.31
Sanders	11325	99.17
Jefferson	11295	99.43
Roosevelt	10445	99.71
Carbon	9900	98.46
Richland	9855	98.95
Rosebud	9250	99.89
Deer Lodge	9240	99.62
Beaverhead	9180	99.46
Stillwater	9060	99.62
Dawson	9015	99.95
Madison	7605	98.90
Valley	7390	99.53
Powell	7050	99.79
Blaine	6505	99.85
Pondera	6065	98.70
Teton	6015	98.93
Chouteau	5740	98.80
Broadwater	5565	99.82
Toole	5170	99.23
Musselshell	4565	99.35
Mineral	4195	99.76
Phillips	4165	99.05
Sweet Grass	3650	99.73
Sheridan	3430	99.57
Granite	3055	99.03
Fallon	3050	100.00
Liberty	2310	99.36
Wheatland	2140	100.00
Judith Basin	2050	100.00
Meagher	1895	99.74
McCone	1810	100.00
Daniels	1725	99.42
Powder River	1635	99.70
Carter	1275	100.00
Prairie	1185	99.16
Garfield	1100	100.00
Wibaux	890	98.89
Golden Valley	770	100.00
Treasure	695	99.29
Petroleum	565	100.00