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The most populated counties in Montana are Yellowstone County with 165,524, Gallatin County at 119,685, Missoula County with 118,541, Flathead County at 105,950, and Cascade County with 84,423. 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 2022 American Community Survey.
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 | 165,524 |
| 2 | Gallatin County | 119,685 |
| 3 | Missoula County | 118,541 |
| 4 | Flathead County | 105,950 |
| 5 | Cascade County | 84,423 |
| 6 | Lewis and Clark County | 71,487 |
| 7 | Ravalli County | 44,876 |
| 8 | Silver Bow County | 35,306 |
| 9 | Lake County | 31,509 |
| 10 | Lincoln County | 20,157 |
| 11 | Park County | 17,320 |
| 12 | Hill County | 16,238 |
| 13 | Glacier County | 13,781 |
| 14 | Big Horn County | 13,090 |
| 15 | Sanders County | 12,615 |
| 16 | Jefferson County | 12,273 |
| 17 | Custer County | 11,957 |
| 18 | Fergus County | 11,496 |
| 19 | Richland County | 11,366 |
| 20 | Roosevelt County | 10,799 |
| 21 | Carbon County | 10,645 |
| 22 | Beaverhead County | 9,469 |
| 23 | Deer Lodge County | 9,435 |
| 24 | Stillwater County | 8,978 |
| 25 | Dawson County | 8,915 |
| 26 | Madison County | 8,742 |
| 27 | Rosebud County | 8,310 |
| 28 | Valley County | 7,552 |
| 29 | Blaine County | 7,030 |
| 30 | Powell County | 6,998 |
| 31 | Broadwater County | 6,977 |
| 32 | Teton County | 6,238 |
| 33 | Pondera County | 5,987 |
| 34 | Chouteau County | 5,897 |
| 35 | Toole County | 5,018 |
| 36 | Musselshell County | 4,924 |
| 37 | Mineral County | 4,652 |
| 38 | Phillips County | 4,233 |
| 39 | Sheridan County | 3,700 |
| 40 | Sweet Grass County | 3,697 |
| 41 | Granite County | 3,368 |
| 42 | Fallon County | 2,941 |
| 43 | Wheatland County | 2,060 |
| 44 | Judith Basin County | 2,039 |
| 45 | Liberty County | 1,993 |
| 46 | Meagher County | 1,948 |
| 47 | Powder River County | 1,773 |
| 48 | McCone County | 1,746 |
| 49 | Daniels County | 1,535 |
| 50 | Carter County | 1,332 |
| 51 | Prairie County | 1,283 |
| 52 | Wibaux County | 1,119 |
| 53 | Garfield County | 976 |
| 54 | Golden Valley County | 841 |
| 55 | Treasure County | 680 |
| 56 | Petroleum County | 416 |
|
United States Census Bureau. B01001 SEX BY AGE, 2022 American Community Survey 5-Year Estimates. U.S. Census Bureau, American Community Survey Office. Web. 7 December 2023. http://www.census.gov/. |
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