Montana Citizen Population By County in 2020 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2020, the citizen population for Montana was 1,051,805 and represented 99.07% of the total Montana population.

Among all Montana counties, Yellowstone had the highest citizen population (159.06K), followed by Missoula (117.50K), and Gallatin (109.60K).

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 2020

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

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Montana Citizen Population By County in 2020

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County	Citizen Population	% of County Population
Yellowstone	159055	99.17
Missoula	117495	98.69
Gallatin	109595	98.38
Flathead	101125	99.14
Cascade	81045	99.35
Lewis and Clark	68315	99.42
Ravalli	43220	99.53
Silver Bow	34575	99.08
Lake	30015	98.78
Lincoln	19570	98.61
Park	16360	99.06
Hill	16330	99.45
Glacier	13520	98.65
Big Horn	13255	99.66
Jefferson	11985	99.30
Sanders	11725	99.32
Custer	11510	99.52
Fergus	11095	99.37
Roosevelt	11015	99.32
Richland	10945	98.65
Carbon	10650	99.63
Stillwater	9520	99.58
Beaverhead	9395	99.37
Deer Lodge	9055	98.91
Rosebud	8965	98.90
Dawson	8785	99.55
Madison	8340	97.77
Valley	7415	99.87
Powell	6820	99.64
Blaine	6680	99.70
Teton	6105	99.67
Broadwater	6020	99.01
Pondera	5855	99.07
Chouteau	5695	99.39
Toole	4785	99.48
Musselshell	4620	98.72
Mineral	4320	99.77
Phillips	3975	98.64
Sweet Grass	3660	99.59
Sheridan	3345	98.67
Granite	3305	99.40
Fallon	2925	98.32
Liberty	2455	100.00
Wheatland	2130	99.53
Judith Basin	1955	99.24
McCone	1815	99.45
Meagher	1755	97.77
Daniels	1695	99.41
Powder River	1610	98.47
Carter	1305	100.00
Prairie	1130	97.41
Garfield	1050	100.00
Wibaux	1030	99.52
Golden Valley	815	100.00
Treasure	615	100.00
Petroleum	465	100.00