Montana Population By County in 2018
Updated on January 27, 2024.
According to the US Census Bureau population estimates, there were 1,061,818 people living in Montana in 2018. Yellowstone County was the most populated county with 160,118 residents, followed by Missoula County with 118,959 residents, and Gallatin County with 111,878 residents. Petroleum County with a population of 517 was the least populated county in Montana in 2018.
Use the map below to interactively explore the population for each county in Montana in 2018. The data can also be explored further by sorting and filtering with the table below.
You can see similar information for other states and by state for the United States.
Related Topics: Montana Census Vintage Data Topic List.
Data Source: US Census Bureau (Vintage).
See this for other years:
Montana Population By County (2018)
Table of Montana Population By County in 2018
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| County | Population | % of State Population |
|---|---|---|
| Beaverhead | 9,413 | 0.89% |
| Big Horn | 13,305 | 1.25% |
| Blaine | 6,764 | 0.64% |
| Broadwater | 6,043 | 0.57% |
| Carbon | 10,654 | 1.00% |
| Carter | 1,223 | 0.12% |
| Cascade | 81,756 | 7.70% |
| Chouteau | 5,759 | 0.54% |
| Custer | 11,576 | 1.09% |
| Daniels | 1,706 | 0.16% |
| Dawson | 8,683 | 0.82% |
| Deer Lodge | 9,159 | 0.86% |
| Fallon | 2,925 | 0.28% |
| Fergus | 11,088 | 1.04% |
| Flathead | 102,100 | 9.62% |
| Gallatin | 111,878 | 10.54% |
| Garfield | 1,262 | 0.12% |
| Glacier | 13,797 | 1.30% |
| Golden Valley | 825 | 0.08% |
| Granite | 3,355 | 0.32% |
| Hill | 16,351 | 1.54% |
| Jefferson | 12,084 | 1.14% |
| Judith Basin | 1,950 | 0.18% |
| Lake | 30,346 | 2.86% |
| Lewis and Clark | 68,775 | 6.48% |
| Liberty | 2,440 | 0.23% |
| Lincoln | 19,862 | 1.87% |
| McCone | 1,655 | 0.16% |
| Madison | 8,586 | 0.81% |
| Meagher | 1,847 | 0.17% |
| Mineral | 4,314 | 0.41% |
| Missoula | 118,959 | 11.20% |
| Musselshell | 4,623 | 0.44% |
| Park | 16,662 | 1.57% |
| Petroleum | 517 | 0.05% |
| Phillips | 4,047 | 0.38% |
| Pondera | 5,936 | 0.56% |
| Powder River | 1,729 | 0.16% |
| Powell | 6,920 | 0.65% |
| Prairie | 1,056 | 0.10% |
| Ravalli | 43,377 | 4.09% |
| Richland | 10,955 | 1.03% |
| Roosevelt | 11,084 | 1.04% |
| Rosebud | 9,047 | 0.85% |
| Sanders | 11,744 | 1.11% |
| Sheridan | 3,379 | 0.32% |
| Silver Bow | 34,768 | 3.27% |
| Stillwater | 9,496 | 0.89% |
| Sweet Grass | 3,701 | 0.35% |
| Teton | 6,121 | 0.58% |
| Toole | 4,830 | 0.46% |
| Treasure | 667 | 0.06% |
| Valley | 7,409 | 0.70% |
| Wheatland | 2,163 | 0.20% |
| Wibaux | 1,029 | 0.10% |
| Yellowstone | 160,118 | 15.08% |