Montana Citizen Population By County in 2015 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2015, the citizen population for Montana was 1,004,845 and represented 99.03% of the total Montana population.

Among all Montana counties, Yellowstone had the highest citizen population (152.38K), followed by Missoula (110.55K), and Gallatin (93.56K).

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 2015

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

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Montana Citizen Population By County in 2015

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County	Citizen Population	% of County Population
Yellowstone	152380	99.15
Missoula	110545	98.73
Gallatin	93560	98.15
Flathead	92575	99.19
Cascade	81470	99.25
Lewis and Clark	64905	99.31
Ravalli	40590	99.42
Silver Bow	33985	98.37
Lake	28880	99.06
Lincoln	19235	99.48
Hill	16430	99.43
Park	15640	99.55
Glacier	13470	98.54
Big Horn	13050	99.32
Custer	11880	99.46
Jefferson	11415	99.26
Fergus	11340	98.87
Sanders	11280	99.43
Roosevelt	11045	99.77
Richland	10985	98.70
Carbon	10165	98.98
Rosebud	9310	99.57
Dawson	9265	98.93
Stillwater	9215	99.19
Deer Lodge	9170	99.57
Beaverhead	9075	97.69
Madison	7630	98.26
Valley	7510	99.14
Powell	6965	99.86
Blaine	6565	99.47
Pondera	6110	98.47
Teton	6015	99.01
Chouteau	5785	98.80
Broadwater	5675	99.74
Toole	5110	99.22
Musselshell	4730	98.75
Mineral	4225	99.65
Phillips	4140	99.40
Sweet Grass	3605	99.18
Sheridan	3600	99.17
Granite	3130	98.74
Fallon	3055	100.00
Liberty	2355	99.37
Wheatland	2100	99.29
Judith Basin	1995	100.00
Meagher	1890	99.47
Daniels	1740	98.86
McCone	1725	99.71
Powder River	1705	100.00
Prairie	1360	99.27
Carter	1225	100.00
Garfield	1045	100.00
Wibaux	975	98.99
Treasure	810	100.00
Golden Valley	755	100.00
Petroleum	445	100.00