Ranking of Montana Counties By Population in 2021
Updated on June 21, 2025.
Based on the US Census Vintage data estimates, in 2021, the Population for Montana was 1.11M. Among all Montana counties, Yellowstone County had the highest population (167.45K), followed by Gallatin County (123.12K), and Missoula County (119.86K).
The chart below shows the top 10 counties, and the table below shows the ranking of all Montana counties.
You can see similar ranking information for related topics, and for other states. You can also see the ranking of all counties in the United States.
Related Topics: Montana Census Vintage Data Topic List.
Data Source: US Census Bureau (Vintage), 2021 Census.
See this for other years:
Ranking of Montana Counties By Population in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | Yellowstone County | 167448 |
| 2 | Gallatin County | 123119 |
| 3 | Missoula County | 119857 |
| 4 | Flathead County | 108790 |
| 5 | Cascade County | 84565 |
| 6 | Lewis and Clark County | 72517 |
| 7 | Ravalli County | 46096 |
| 8 | Silver Bow County | 35510 |
| 9 | Lake County | 32081 |
| 10 | Lincoln County | 20597 |
| 11 | Park County | 17525 |
| 12 | Hill County | 16207 |
| 13 | Glacier County | 13723 |
| 14 | Sanders County | 12949 |
| 15 | Big Horn County | 12894 |
| 16 | Jefferson County | 12472 |
| 17 | Custer County | 11961 |
| 18 | Fergus County | 11619 |
| 19 | Richland County | 11330 |
| 20 | Carbon County | 10900 |
| 21 | Roosevelt County | 10788 |
| 22 | Beaverhead County | 9551 |
| 23 | Deer Lodge County | 9522 |
| 24 | Stillwater County | 9026 |
| 25 | Madison County | 8954 |
| 26 | Dawson County | 8859 |
| 27 | Rosebud County | 8082 |
| 28 | Valley County | 7566 |
| 29 | Broadwater County | 7327 |
| 30 | Powell County | 7023 |
| 31 | Blaine County | 6999 |
| 32 | Teton County | 6279 |
| 33 | Pondera County | 6017 |
| 34 | Chouteau County | 5939 |
| 35 | Toole County | 4987 |
| 36 | Musselshell County | 4910 |
| 37 | Mineral County | 4859 |
| 38 | Phillips County | 4209 |
| 39 | Sweet Grass County | 3702 |
| 40 | Sheridan County | 3572 |
| 41 | Granite County | 3354 |
| 42 | Fallon County | 3011 |
| 43 | Judith Basin County | 2041 |
| 44 | Wheatland County | 2039 |
| 45 | Meagher County | 1963 |
| 46 | Liberty County | 1937 |
| 47 | McCone County | 1710 |
| 48 | Powder River County | 1707 |
| 49 | Daniels County | 1671 |
| 50 | Carter County | 1416 |
| 51 | Garfield County | 1206 |
| 52 | Prairie County | 1096 |
| 53 | Wibaux County | 936 |
| 54 | Golden Valley County | 816 |
| 55 | Treasure County | 768 |
| 56 | Petroleum County | 520 |
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