Montana 2010 Population By County
Updated on December 2, 2021.

According to the US Census Bureau population estimates, there were 990,730 people living in Montana in 2010. Yellowstone County was the most populated county with 148,405 residents, followed by Missoula County with 109,471 residents, and Flathead County with 90,863 residents. Petroleum County with a population of 489 was the least populated county in Montana in 2010.

Use the map below to interactively explore the population of each county in Montana in 2010. The data can also be explored further by sorting and filtering with the table below.

Montana 2010 Population By County
See also Population estimate for other years:
Table of Montana 2010 Population By County
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County Population % of State Population
Beaverhead 9,257 0.93
Big Horn 12,912 1.30
Blaine 6,503 0.66
Broadwater 5,632 0.57
Carbon 10,063 1.02
Carter 1,159 0.12
Cascade 81,513 8.23
Chouteau 5,810 0.59
Custer 11,691 1.18
Daniels 1,749 0.18
Dawson 8,952 0.90
Deer Lodge 9,291 0.94
Fallon 2,889 0.29
Fergus 11,585 1.17
Flathead 90,863 9.17
Gallatin 89,662 9.05
Garfield 1,192 0.12
Glacier 13,421 1.36
Golden Valley 879 0.09
Granite 3,073 0.31
Hill 16,151 1.63
Jefferson 11,406 1.15
Judith Basin 2,075 0.21
Lake 28,792 2.91
Lewis and Clark 63,578 6.42
Liberty 2,349 0.24
Lincoln 19,693 1.99
McCone 1,745 0.18
Madison 7,696 0.78
Meagher 1,878 0.19
Mineral 4,230 0.43
Missoula 109,471 11.05
Musselshell 4,555 0.46
Park 15,595 1.57
Petroleum 489 0.05
Phillips 4,252 0.43
Pondera 6,161 0.62
Powder River 1,739 0.18
Powell 7,019 0.71
Prairie 1,183 0.12
Ravalli 40,323 4.07
Richland 9,760 0.99
Roosevelt 10,444 1.05
Rosebud 9,245 0.93
Sanders 11,395 1.15
Sheridan 3,368 0.34
Silver Bow 34,235 3.46
Stillwater 9,112 0.92
Sweet Grass 3,617 0.37
Teton 6,074 0.61
Toole 5,343 0.54
Treasure 714 0.07
Valley 7,378 0.75
Wheatland 2,156 0.22
Wibaux 1,008 0.10
Yellowstone 148,405 14.98