# Counties in Montana by population density, 2025

All 56 values come from U.S. Census Bureau for 2025, so the places are comparable.

- Indicator id: `population_density`
- Unit: inhabitants per km²
- Definition: Resident population divided by land area in km². World Bank figures use mid-year population and land area excluding inland water.
- Source: U.S. Census Bureau, Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km² (https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/)
- Retrieved: 2026-10-09
- Citation: U.S. Census Bureau. Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-09.
- Web page: https://invokely.ai/rankings/population-density/montana-counties
- CSV: https://invokely.ai/download/rankings/population-density/montana-counties.csv

| Rank | Place | inhabitants per km² |
|---:|---|---:|
| 1 | Yellowstone County | 25.3 |
| 2 | Silver Bow County | 19.4 |
| 3 | Gallatin County | 19.1 |
| 4 | Missoula County | 18.4 |
| 5 | Cascade County | 12.2 |
| 6 | Flathead County | 8.8 |
| 7 | Lake County | 8.7 |
| 8 | Lewis and Clark County | 8.4 |
| 9 | Ravalli County | 7.8 |
| 10 | Deer Lodge County | 5.1 |
| 11 | Jefferson County | 3.1 |
| 12 | Broadwater County | 2.8 |
| 13 | Park County | 2.5 |
| 14 | Lincoln County | 2.4 |
| 15 | Carbon County | 2.2 |
| 16 | Hill County | 2.2 |
| 17 | Richland County | 2.1 |
| 18 | Stillwater County | 2 |
| 19 | Sanders County | 2 |
| 20 | Glacier County | 1.7 |
| 21 | Roosevelt County | 1.7 |
| 22 | Mineral County | 1.6 |
| 23 | Pondera County | 1.4 |
| 24 | Dawson County | 1.4 |
| 25 | Custer County | 1.2 |
| 26 | Powell County | 1.2 |
| 27 | Musselshell County | 1.2 |
| 28 | Teton County | 1.1 |
| 29 | Madison County | 1.1 |
| 30 | Fergus County | 1.1 |
| 31 | Toole County | 1.1 |
| 32 | Big Horn County | 1 |
| 33 | Granite County | 0.8 |
| 34 | Sheridan County | 0.8 |
| 35 | Sweet Grass County | 0.8 |
| 36 | Fallon County | 0.7 |
| 37 | Beaverhead County | 0.7 |
| 38 | Rosebud County | 0.6 |
| 39 | Blaine County | 0.6 |
| 40 | Valley County | 0.6 |
| 41 | Chouteau County | 0.6 |
| 41 | Wheatland County | 0.6 |
| 43 | Liberty County | 0.5 |
| 44 | Judith Basin County | 0.4 |
| 45 | Daniels County | 0.4 |
| 46 | Wibaux County | 0.4 |
| 47 | Meagher County | 0.3 |
| 48 | Phillips County | 0.3 |
| 49 | Treasure County | 0.3 |
| 50 | Golden Valley County | 0.3 |
| 51 | McCone County | 0.3 |
| 52 | Prairie County | 0.2 |
| 53 | Powder River County | 0.2 |
| 54 | Carter County | 0.2 |
| 55 | Petroleum County | 0.1 |
| 56 | Garfield County | 0.1 |