Montana Citizen Population By County in 2013 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2013, the citizen population for Montana was 989,315 and represented 99.08% of the total Montana population.

Among all Montana counties, Yellowstone had the highest citizen population (149.11K), followed by Missoula (108.69K), and Flathead (90.63K).

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 Population By County in 2013
Montana Citizen Population By County in 2013
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County Citizen Population % of County Population
Yellowstone 149110 99.30
Missoula 108685 98.59
Flathead 90625 99.01
Gallatin 89980 98.34
Cascade 80945 99.17
Lewis and Clark 63660 99.24
Ravalli 40080 99.15
Silver Bow 33950 98.92
Lake 28625 99.03
Lincoln 19430 99.23
Hill 16160 99.14
Park 15490 99.17
Glacier 13385 98.93
Big Horn 12900 99.69
Custer 11710 99.36
Fergus 11390 98.91
Jefferson 11355 99.30
Sanders 11320 99.30
Roosevelt 10620 99.58
Richland 10215 98.98
Carbon 10045 99.21
Rosebud 9290 99.79
Deer Lodge 9240 99.52
Beaverhead 9225 99.41
Stillwater 9135 99.56
Dawson 9085 99.51
Madison 7635 99.16
Valley 7435 99.60
Powell 7045 99.93
Blaine 6525 99.62
Pondera 6075 98.54
Teton 6005 99.01
Chouteau 5765 98.97
Broadwater 5655 99.82
Toole 5160 98.76
Musselshell 4690 99.15
Mineral 4205 99.65
Phillips 4175 99.29
Sweet Grass 3605 99.04
Sheridan 3445 99.14
Fallon 3080 99.84
Granite 3070 98.87
Liberty 2340 99.36
Wheatland 2140 100.00
Judith Basin 2045 100.00
Meagher 1890 99.21
McCone 1795 100.00
Daniels 1760 98.88
Powder River 1670 100.00
Carter 1240 100.00
Prairie 1180 99.58
Garfield 1145 100.00
Wibaux 930 100.00
Golden Valley 710 100.00
Treasure 710 100.00
Petroleum 540 100.00