Montana Population By County in 2011

Updated on January 27, 2024.

Based on the US Census Vintage data estimates, in 2011, the population of Montana was 997,518. Among all Montana counties, Yellowstone had the highest population (149,805), followed by Missoula (110,270), and Gallatin (91,413). Petroleum was the least populated county (491).

Hover over or click on the counties in the map below to see the populations. The data can also be found in a table below. You can use the table to sort, filter, and explore the data further.

You can see similar information for other states and by state for the United States.

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Montana Population By County in 2011
Montana Population By County in 2011
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County Population % of State Population
Beaverhead 9214 0.92
Big Horn 13058 1.31
Blaine 6576 0.66
Broadwater 5725 0.57
Carbon 10089 1.01
Carter 1136 0.11
Cascade 81734 8.19
Chouteau 5812 0.58
Custer 11759 1.18
Daniels 1760 0.18
Dawson 9030 0.91
Deer Lodge 9282 0.93
Fallon 2930 0.29
Fergus 11463 1.15
Flathead 91282 9.15
Gallatin 91413 9.16
Garfield 1254 0.13
Glacier 13579 1.36
Golden Valley 830 0.08
Granite 3077 0.31
Hill 16391 1.64
Jefferson 11373 1.14
Judith Basin 2011 0.20
Lake 28983 2.91
Lewis and Clark 64284 6.44
Liberty 2381 0.24
Lincoln 19629 1.97
McCone 1709 0.17
Madison 7644 0.77
Meagher 1878 0.19
Mineral 4221 0.42
Missoula 110270 11.05
Musselshell 4747 0.48
Park 15512 1.56
Petroleum 491 0.05
Phillips 4186 0.42
Pondera 6195 0.62
Powder River 1739 0.17
Powell 7084 0.71
Prairie 1141 0.11
Ravalli 40387 4.05
Richland 10151 1.02
Roosevelt 10496 1.05
Rosebud 9328 0.94
Sanders 11402 1.14
Sheridan 3418 0.34
Silver Bow 34420 3.45
Stillwater 9153 0.92
Sweet Grass 3584 0.36
Teton 6060 0.61
Toole 5157 0.52
Treasure 709 0.07
Valley 7463 0.75
Wheatland 2131 0.21
Wibaux 982 0.10
Yellowstone 149805 15.02