Montana Citizen Population By County in 2011 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2011, the citizen population for Montana was 973,480 and represented 99.05% of the total Montana population.

Among all Montana counties, Yellowstone had the highest citizen population (145.13K), followed by Missoula (107.10K), and Flathead (89.15K).

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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Montana Citizen Voting-age Population By County in 2011

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

See this for other years:

Montana Citizen Population By County in 2011

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County	Citizen Population	% of County Population
Yellowstone	145125	99.30
Missoula	107095	98.77
Flathead	89150	98.71
Gallatin	87645	98.32
Cascade	80325	99.25
Lewis and Clark	62090	99.19
Ravalli	39770	98.93
Silver Bow	33710	99.19
Lake	28330	98.95
Lincoln	19395	99.08
Hill	15935	99.04
Park	15600	99.33
Glacier	13220	99.18
Big Horn	12760	99.88
Custer	11550	99.40
Fergus	11405	99.05
Sanders	11310	99.04
Jefferson	11205	99.34
Roosevelt	10295	99.71
Carbon	9870	98.55
Richland	9530	98.55
Deer Lodge	9290	99.95
Rosebud	9190	99.89
Beaverhead	9005	98.20
Stillwater	8995	99.67
Dawson	8955	99.94
Madison	7560	98.76
Valley	7345	99.39
Powell	7025	99.36
Blaine	6470	99.92
Pondera	6060	98.30
Teton	6030	98.77
Chouteau	5710	98.70
Broadwater	5440	99.91
Toole	5140	99.32
Musselshell	4385	99.10
Mineral	4190	99.88
Phillips	4165	98.58
Sweet Grass	3655	98.78
Sheridan	3405	99.42
Granite	3040	99.51
Fallon	2835	99.13
Liberty	2280	99.13
Wheatland	2140	100.00
Judith Basin	2055	99.76
Meagher	1890	99.47
McCone	1815	100.00
Daniels	1715	99.71
Powder River	1650	99.70
Carter	1265	100.00
Garfield	1160	100.00
Prairie	1095	100.00
Wibaux	955	98.96
Golden Valley	875	100.00
Treasure	825	100.00
Petroleum	570	100.00