Ranking of Montana Counties By Total Population from Census 2020
Updated on February 7, 2023.
According to the data from the US 2020 Census, the most populated Montana county as at April 2020 was Yellowstone County (164.73K), followed by Gallatin County (118.96K), and Missoula County (117.92K).
The chart below shows the top 10 most populated counties, and the table below shows the ranking of all the counties in the state of Montana.
You can also see the ranking of counties by population for other states as well as for the whole United States.
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Related Topics: Montana Census 2020 Topic List.
Data Source: US Census Bureau, 2020 Census.
Ranking of Montana Counties By Total Population from Census 2020
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| Rank | County | Population |
|---|---|---|
| 1 | Yellowstone County | 164731 |
| 2 | Gallatin County | 118960 |
| 3 | Missoula County | 117922 |
| 4 | Flathead County | 104357 |
| 5 | Cascade County | 84414 |
| 6 | Lewis and Clark County | 70973 |
| 7 | Ravalli County | 44174 |
| 8 | Silver Bow County | 35133 |
| 9 | Lake County | 31134 |
| 10 | Lincoln County | 19677 |
| 11 | Park County | 17191 |
| 12 | Hill County | 16309 |
| 13 | Glacier County | 13778 |
| 14 | Big Horn County | 13124 |
| 15 | Sanders County | 12400 |
| 16 | Jefferson County | 12085 |
| 17 | Custer County | 11867 |
| 18 | Richland County | 11491 |
| 19 | Fergus County | 11446 |
| 20 | Roosevelt County | 10794 |
| 21 | Carbon County | 10473 |
| 22 | Deer Lodge County | 9421 |
| 23 | Beaverhead County | 9371 |
| 24 | Stillwater County | 8963 |
| 25 | Dawson County | 8940 |
| 26 | Madison County | 8623 |
| 27 | Rosebud County | 8329 |
| 28 | Valley County | 7578 |
| 29 | Blaine County | 7044 |
| 30 | Powell County | 6946 |
| 31 | Broadwater County | 6774 |
| 32 | Teton County | 6226 |
| 33 | Pondera County | 5898 |
| 34 | Chouteau County | 5895 |
| 35 | Toole County | 4971 |
| 36 | Musselshell County | 4730 |
| 37 | Mineral County | 4535 |
| 38 | Phillips County | 4217 |
| 39 | Sweet Grass County | 3678 |
| 40 | Sheridan County | 3539 |
| 41 | Granite County | 3309 |
| 42 | Fallon County | 3049 |
| 43 | Wheatland County | 2069 |
| 44 | Judith Basin County | 2023 |
| 45 | Liberty County | 1959 |
| 46 | Meagher County | 1927 |
| 47 | McCone County | 1729 |
| 48 | Powder River County | 1694 |
| 49 | Daniels County | 1661 |
| 50 | Carter County | 1415 |
| 51 | Garfield County | 1173 |
| 52 | Prairie County | 1088 |
| 53 | Wibaux County | 937 |
| 54 | Golden Valley County | 823 |
| 55 | Treasure County | 762 |
| 56 | Petroleum County | 496 |