Montana Citizen Population By County in 2023 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2023, the citizen population for Montana was 1,093,945 and represented 98.99% of the total Montana population.

Among all Montana counties, Yellowstone had the highest citizen population (165.83K), followed by Gallatin (119.72K), and Missoula (118.07K).

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 2023

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

See this for other years:

Montana Citizen Population By County in 2023

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County	Citizen Population	% of County Population
Yellowstone	165830	99.10
Gallatin	119715	97.97
Missoula	118070	98.69
Flathead	107230	98.88
Cascade	84095	99.40
Lewis and Clark	72055	99.28
Ravalli	45410	99.14
Silver Bow	35310	99.21
Lake	31725	98.91
Lincoln	20320	98.38
Park	17355	99.26
Hill	16210	99.69
Glacier	13655	99.56
Big Horn	12935	99.77
Sanders	12880	99.58
Jefferson	12380	99.04
Custer	11865	99.37
Fergus	11535	99.61
Richland	11100	97.97
Carbon	10785	99.17
Roosevelt	10620	99.58
Beaverhead	9530	99.37
Deer Lodge	9490	99.79
Stillwater	9030	99.78
Madison	8875	98.89
Dawson	8835	99.55
Rosebud	8175	99.27
Valley	7495	99.40
Broadwater	7260	99.32
Powell	7000	99.57
Blaine	6960	99.50
Teton	6280	99.84
Pondera	5965	99.25
Chouteau	5860	99.49
Musselshell	5005	98.72
Toole	4950	98.41
Mineral	4780	99.69
Phillips	4180	98.94
Sweet Grass	3710	99.87
Sheridan	3635	98.91
Granite	3370	98.54
Fallon	2815	100.00
Wheatland	2045	99.76
Judith Basin	2020	98.30
Meagher	1955	98.74
Liberty	1950	98.99
McCone	1820	100.00
Powder River	1725	98.01
Daniels	1515	99.34
Carter	1360	100.00
Prairie	1200	96.00
Wibaux	1150	100.00
Garfield	940	100.00
Golden Valley	840	100.00
Treasure	745	98.03
Petroleum	400	100.00