Montana 2011 Population By County
Updated on December 2, 2021.

According to the US Census Bureau population estimates, there were 997,518 people living in Montana in 2011. Yellowstone County was the most populated county with 149,805 residents, followed by Missoula County with 110,270 residents, and Gallatin County with 91,413 residents. Petroleum County with a population of 491 was the least populated county in Montana in 2011.

Use the map below to interactively explore the population of each county in Montana in 2011. The data can also be explored further by sorting and filtering with the table below.

Montana 2011 Population By County
See also Population estimate for other years:
Table of Montana 2011 Population By County
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County Population % of State Population
Beaverhead 9,214 0.92
Big Horn 13,058 1.31
Blaine 6,576 0.66
Broadwater 5,725 0.57
Carbon 10,089 1.01
Carter 1,136 0.11
Cascade 81,734 8.19
Chouteau 5,812 0.58
Custer 11,759 1.18
Daniels 1,760 0.18
Dawson 9,030 0.91
Deer Lodge 9,282 0.93
Fallon 2,930 0.29
Fergus 11,463 1.15
Flathead 91,282 9.15
Gallatin 91,413 9.16
Garfield 1,254 0.13
Glacier 13,579 1.36
Golden Valley 830 0.08
Granite 3,077 0.31
Hill 16,391 1.64
Jefferson 11,373 1.14
Judith Basin 2,011 0.20
Lake 28,983 2.91
Lewis and Clark 64,284 6.44
Liberty 2,381 0.24
Lincoln 19,629 1.97
McCone 1,709 0.17
Madison 7,644 0.77
Meagher 1,878 0.19
Mineral 4,221 0.42
Missoula 110,270 11.05
Musselshell 4,747 0.48
Park 15,512 1.56
Petroleum 491 0.05
Phillips 4,186 0.42
Pondera 6,195 0.62
Powder River 1,739 0.17
Powell 7,084 0.71
Prairie 1,141 0.11
Ravalli 40,387 4.05
Richland 10,151 1.02
Roosevelt 10,496 1.05
Rosebud 9,328 0.94
Sanders 11,402 1.14
Sheridan 3,418 0.34
Silver Bow 34,420 3.45
Stillwater 9,153 0.92
Sweet Grass 3,584 0.36
Teton 6,060 0.61
Toole 5,157 0.52
Treasure 709 0.07
Valley 7,463 0.75
Wheatland 2,131 0.21
Wibaux 982 0.10
Yellowstone 149,805 15.02