Montana Citizen Population By County in 2016 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2016, the citizen population for Montana was 1,013,805 and represented 99.06% of the total Montana population.

Among all Montana counties, Yellowstone had the highest citizen population (154.12K), followed by Missoula (111.64K), and Gallatin (96.07K).

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 2016

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

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Montana Citizen Population By County in 2016

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County	Citizen Population	% of County Population
Yellowstone	154120	99.21
Missoula	111635	98.71
Gallatin	96070	98.07
Flathead	94005	99.27
Cascade	81505	99.34
Lewis and Clark	65600	99.41
Ravalli	41005	99.70
Silver Bow	34030	98.47
Lake	29015	98.99
Lincoln	19150	99.38
Hill	16475	99.67
Park	15720	99.21
Glacier	13555	98.98
Big Horn	13085	99.02
Custer	11905	99.37
Jefferson	11515	99.27
Sanders	11330	99.60
Fergus	11285	98.73
Richland	11250	98.77
Roosevelt	11170	99.47
Carbon	10300	99.61
Dawson	9325	98.89
Rosebud	9280	99.25
Stillwater	9255	99.09
Deer Lodge	9150	99.73
Beaverhead	9065	97.32
Madison	7625	97.63
Valley	7515	99.21
Powell	6920	99.86
Blaine	6585	99.62
Pondera	6105	99.03
Teton	6040	99.59
Chouteau	5800	99.40
Broadwater	5670	99.65
Toole	5065	99.02
Musselshell	4735	99.06
Mineral	4215	99.76
Phillips	4140	99.76
Sheridan	3615	99.18
Sweet Grass	3605	99.18
Granite	3175	98.91
Fallon	2895	99.31
Liberty	2290	100.00
Wheatland	2080	98.58
Judith Basin	1975	99.75
Meagher	1950	99.49
Daniels	1775	99.44
McCone	1670	99.41
Powder River	1630	98.79
Prairie	1400	98.94
Carter	1295	100.00
Wibaux	1135	99.13
Garfield	1060	100.00
Treasure	845	100.00
Golden Valley	730	100.00
Petroleum	445	100.00