# Counties in Montana by population, 2025

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

- Indicator id: `population`
- Unit: persons
- Definition: Resident population. Spain and the EU: 1 January, with Spanish figures from the official municipal register (Padrón). United States: Census Bureau population estimates for 1 July. Other countries and the World: World Bank mid-year estimates, which count all residents regardless of legal status or citizenship.
- Source: U.S. Census Bureau, Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program) (https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/)
- Retrieved: 2026-10-08
- Citation: U.S. Census Bureau. Annual estimates of the resident population for the United States, states and counties, 1 July (Population Estimates Program). https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-08.
- Web page: https://invokely.ai/rankings/population/montana-counties
- CSV: https://invokely.ai/download/rankings/population/montana-counties.csv

| Rank | Place | persons |
|---:|---|---:|
| 1 | Yellowstone County | 172,692 |
| 2 | Gallatin County | 128,740 |
| 3 | Missoula County | 123,513 |
| 4 | Flathead County | 115,429 |
| 5 | Cascade County | 85,029 |
| 6 | Lewis and Clark County | 75,331 |
| 7 | Ravalli County | 48,582 |
| 8 | Silver Bow County | 36,118 |
| 9 | Lake County | 33,392 |
| 10 | Lincoln County | 22,328 |
| 11 | Park County | 18,214 |
| 12 | Hill County | 16,167 |
| 13 | Sanders County | 14,062 |
| 14 | Glacier County | 13,463 |
| 15 | Jefferson County | 13,329 |
| 16 | Big Horn County | 12,752 |
| 17 | Custer County | 12,034 |
| 18 | Fergus County | 11,825 |
| 19 | Carbon County | 11,466 |
| 20 | Richland County | 11,377 |
| 21 | Roosevelt County | 10,242 |
| 22 | Beaverhead County | 10,043 |
| 23 | Madison County | 10,026 |
| 24 | Deer Lodge County | 9,709 |
| 25 | Stillwater County | 9,445 |
| 26 | Dawson County | 8,692 |
| 27 | Broadwater County | 8,493 |
| 28 | Rosebud County | 8,253 |
| 29 | Valley County | 7,385 |
| 30 | Powell County | 7,157 |
| 31 | Blaine County | 6,860 |
| 32 | Teton County | 6,496 |
| 33 | Pondera County | 6,072 |
| 34 | Chouteau County | 5,865 |
| 35 | Musselshell County | 5,582 |
| 36 | Toole County | 5,211 |
| 37 | Mineral County | 5,185 |
| 38 | Phillips County | 4,203 |
| 39 | Sweet Grass County | 3,762 |
| 40 | Granite County | 3,658 |
| 41 | Sheridan County | 3,436 |
| 42 | Fallon County | 2,959 |
| 43 | Judith Basin County | 2,162 |
| 44 | Meagher County | 2,137 |
| 45 | Wheatland County | 2,100 |
| 46 | Liberty County | 1,957 |
| 47 | Powder River County | 1,781 |
| 48 | McCone County | 1,720 |
| 49 | Daniels County | 1,612 |
| 50 | Carter County | 1,383 |
| 51 | Garfield County | 1,148 |
| 52 | Prairie County | 1,112 |
| 53 | Wibaux County | 885 |
| 54 | Golden Valley County | 844 |
| 55 | Treasure County | 728 |
| 56 | Petroleum County | 548 |