Ranking of Montana Counties By Population in 2023
Updated on June 21, 2025.
Based on the US Census Vintage data estimates, in 2023, the Population for Montana was 1.13M. Among all Montana counties, Yellowstone County had the highest population (170.73K), followed by Gallatin County (125.93K), and Missoula County (121.67K).
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), 2023 Census.
See this for other years:
Ranking of Montana Counties By Population in 2023
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| Rank | County | Population |
|---|---|---|
| 1 | Yellowstone County | 170727 |
| 2 | Gallatin County | 125929 |
| 3 | Missoula County | 121672 |
| 4 | Flathead County | 113495 |
| 5 | Cascade County | 84625 |
| 6 | Lewis and Clark County | 74812 |
| 7 | Ravalli County | 47760 |
| 8 | Silver Bow County | 36193 |
| 9 | Lake County | 33255 |
| 10 | Lincoln County | 21867 |
| 11 | Park County | 17938 |
| 12 | Hill County | 16181 |
| 13 | Sanders County | 13726 |
| 14 | Glacier County | 13577 |
| 15 | Jefferson County | 13086 |
| 16 | Big Horn County | 12825 |
| 17 | Custer County | 12013 |
| 18 | Fergus County | 11816 |
| 19 | Carbon County | 11426 |
| 20 | Richland County | 11094 |
| 21 | Roosevelt County | 10327 |
| 22 | Beaverhead County | 9889 |
| 23 | Deer Lodge County | 9685 |
| 24 | Madison County | 9509 |
| 25 | Stillwater County | 9237 |
| 26 | Dawson County | 8820 |
| 27 | Rosebud County | 8123 |
| 28 | Broadwater County | 8063 |
| 29 | Valley County | 7475 |
| 30 | Powell County | 7122 |
| 31 | Blaine County | 6884 |
| 32 | Teton County | 6439 |
| 33 | Pondera County | 6108 |
| 34 | Chouteau County | 5877 |
| 35 | Musselshell County | 5377 |
| 36 | Mineral County | 5135 |
| 37 | Toole County | 5128 |
| 38 | Phillips County | 4248 |
| 39 | Sweet Grass County | 3749 |
| 40 | Granite County | 3565 |
| 41 | Sheridan County | 3490 |
| 42 | Fallon County | 2999 |
| 43 | Judith Basin County | 2099 |
| 44 | Wheatland County | 2068 |
| 45 | Meagher County | 2057 |
| 46 | Liberty County | 1959 |
| 47 | Powder River County | 1731 |
| 48 | McCone County | 1684 |
| 49 | Daniels County | 1626 |
| 50 | Carter County | 1400 |
| 51 | Garfield County | 1216 |
| 52 | Prairie County | 1115 |
| 53 | Wibaux County | 904 |
| 54 | Golden Valley County | 867 |
| 55 | Treasure County | 767 |
| 56 | Petroleum County | 543 |
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