Montana Counties by Population (2024)
by Kristen Carney 
Updated: June 20, 2024
The most populated counties in Montana are Yellowstone County with 170,843, Gallatin County at 126,409, Missoula County with 121,849, Flathead County at 113,679, and Cascade County with 84,900. You can get the most current Census population data for all 56 Montana counties, sorted from the most populous counties in Montana to the least, according to the 2023 Population Estimates Program.
Sure, you can copy this list right into your favorite spreadsheet tool. Or save yourself formatting headaches and grab the latest Montana counties population data as a ready-to-use Excel™ file below. It's time to stop searching and start digging into data!
| Rank | County | Population |
|---|---|---|
| 1 | Yellowstone County | 170,843 |
| 2 | Gallatin County | 126,409 |
| 3 | Missoula County | 121,849 |
| 4 | Flathead County | 113,679 |
| 5 | Cascade County | 84,900 |
| 6 | Lewis and Clark County | 75,011 |
| 7 | Ravalli County | 47,738 |
| 8 | Silver Bow County | 36,360 |
| 9 | Lake County | 33,338 |
| 10 | Lincoln County | 21,895 |
| 11 | Park County | 17,903 |
| 12 | Hill County | 16,276 |
| 13 | Sanders County | 13,684 |
| 14 | Glacier County | 13,609 |
| 15 | Jefferson County | 13,048 |
| 16 | Big Horn County | 12,751 |
| 17 | Custer County | 11,985 |
| 18 | Fergus County | 11,772 |
| 19 | Carbon County | 11,419 |
| 20 | Richland County | 11,173 |
| 21 | Roosevelt County | 10,319 |
| 22 | Beaverhead County | 9,885 |
| 23 | Deer Lodge County | 9,673 |
| 24 | Madison County | 9,521 |
| 25 | Stillwater County | 9,173 |
| 26 | Dawson County | 8,810 |
| 27 | Rosebud County | 8,160 |
| 28 | Broadwater County | 8,032 |
| 29 | Valley County | 7,474 |
| 30 | Powell County | 7,133 |
| 31 | Blaine County | 6,899 |
| 32 | Teton County | 6,430 |
| 33 | Pondera County | 6,125 |
| 34 | Chouteau County | 5,847 |
| 35 | Musselshell County | 5,308 |
| 36 | Toole County | 5,133 |
| 37 | Mineral County | 5,090 |
| 38 | Phillips County | 4,249 |
| 39 | Sweet Grass County | 3,763 |
| 40 | Granite County | 3,595 |
| 41 | Sheridan County | 3,498 |
| 42 | Fallon County | 2,994 |
| 43 | Judith Basin County | 2,093 |
| 44 | Meagher County | 2,071 |
| 45 | Wheatland County | 2,057 |
| 46 | Liberty County | 1,974 |
| 47 | Powder River County | 1,743 |
| 48 | McCone County | 1,676 |
| 49 | Daniels County | 1,633 |
| 50 | Carter County | 1,418 |
| 51 | Garfield County | 1,211 |
| 52 | Prairie County | 1,112 |
| 53 | Wibaux County | 910 |
| 54 | Golden Valley County | 835 |
| 55 | Treasure County | 772 |
| 56 | Petroleum County | 554 |
|
United States Census Bureau. Annual Estimates of the Resident Population: April 1, 2020 to July 1, 2023. U.S. Census Bureau, Population Division. Web. May 2024. http://www.census.gov/. |
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