Montana 2019 Population By County
Updated on June 22, 2021.

According to the US Census Bureau population estimates, there were 1,068,778 people living in Montana in 2019. Yellowstone County was the most populated county with 161,300 residents, followed by Missoula County with 119,600 residents, and Gallatin County with 114,434 residents. Petroleum County with a population of 487 was the least populated county in Montana in 2019.

Use the map below to interactively explore the population of each county in Montana in 2019. The data can also be explored further by sorting and filtering with the table below.

Montana 2019 Population By County
See also Population estimate for other years:
Table of Montana 2019 Population By County
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County Population % of State Population
Beaverhead 9,453 0.88%
Big Horn 13,319 1.25%
Blaine 6,681 0.63%
Broadwater 6,237 0.58%
Carbon 10,725 1.00%
Carter 1,252 0.12%
Cascade 81,366 7.61%
Chouteau 5,635 0.53%
Custer 11,402 1.07%
Daniels 1,690 0.16%
Dawson 8,613 0.81%
Deer Lodge 9,140 0.86%
Fallon 2,846 0.27%
Fergus 11,050 1.03%
Flathead 103,806 9.71%
Gallatin 114,434 10.71%
Garfield 1,258 0.12%
Glacier 13,753 1.29%
Golden Valley 821 0.08%
Granite 3,379 0.32%
Hill 16,484 1.54%
Jefferson 12,221 1.14%
Judith Basin 2,007 0.19%
Lake 30,458 2.85%
Lewis and Clark 69,432 6.50%
Liberty 2,337 0.22%
Lincoln 19,980 1.87%
McCone 1,664 0.16%
Madison 8,600 0.81%
Meagher 1,862 0.17%
Mineral 4,397 0.41%
Missoula 119,600 11.19%
Musselshell 4,633 0.43%
Park 16,606 1.55%
Petroleum 487 0.05%
Phillips 3,954 0.37%
Pondera 5,911 0.55%
Powder River 1,682 0.16%
Powell 6,890 0.65%
Prairie 1,077 0.10%
Ravalli 43,806 4.10%
Richland 10,803 1.01%
Roosevelt 11,004 1.03%
Rosebud 8,937 0.84%
Sanders 12,113 1.13%
Sheridan 3,309 0.31%
Silver Bow 34,915 3.27%
Stillwater 9,642 0.90%
Sweet Grass 3,737 0.35%
Teton 6,147 0.57%
Toole 4,736 0.44%
Treasure 696 0.07%
Valley 7,396 0.69%
Wheatland 2,126 0.20%
Wibaux 969 0.09%
Yellowstone 161,300 15.09%