Ranking of Montana Counties By Population in 2019
Updated on June 18, 2025.
Based on the US Census Vintage data estimates, in 2019, the Population for Montana was 1.07M. Among all Montana counties, Yellowstone County had the highest population (161.35K), followed by Missoula County (120.07K), and Gallatin County (114.47K).
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), 2019 Census.
See this for other years:
Ranking of Montana Counties By Population in 2019
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| Rank | County | Population |
|---|---|---|
| 1 | Yellowstone County | 161349 |
| 2 | Missoula County | 120066 |
| 3 | Gallatin County | 114472 |
| 4 | Flathead County | 103880 |
| 5 | Cascade County | 81393 |
| 6 | Lewis and Clark County | 69578 |
| 7 | Ravalli County | 44149 |
| 8 | Silver Bow County | 34901 |
| 9 | Lake County | 30586 |
| 10 | Lincoln County | 20099 |
| 11 | Park County | 16612 |
| 12 | Hill County | 16494 |
| 13 | Glacier County | 13701 |
| 14 | Big Horn County | 13248 |
| 15 | Jefferson County | 12211 |
| 16 | Sanders County | 11946 |
| 17 | Custer County | 11361 |
| 18 | Fergus County | 11032 |
| 19 | Roosevelt County | 11027 |
| 20 | Richland County | 10943 |
| 21 | Carbon County | 10703 |
| 22 | Stillwater County | 9671 |
| 23 | Beaverhead County | 9474 |
| 24 | Deer Lodge County | 9207 |
| 25 | Rosebud County | 8955 |
| 26 | Madison County | 8749 |
| 27 | Dawson County | 8638 |
| 28 | Valley County | 7390 |
| 29 | Powell County | 6854 |
| 30 | Blaine County | 6704 |
| 31 | Broadwater County | 6203 |
| 32 | Teton County | 6150 |
| 33 | Pondera County | 5858 |
| 34 | Chouteau County | 5681 |
| 35 | Toole County | 4709 |
| 36 | Musselshell County | 4626 |
| 37 | Mineral County | 4422 |
| 38 | Phillips County | 3955 |
| 39 | Sweet Grass County | 3717 |
| 40 | Granite County | 3335 |
| 41 | Sheridan County | 3318 |
| 42 | Fallon County | 2878 |
| 43 | Liberty County | 2386 |
| 44 | Wheatland County | 2102 |
| 45 | Judith Basin County | 2010 |
| 46 | Meagher County | 1841 |
| 47 | Powder River County | 1688 |
| 48 | McCone County | 1649 |
| 49 | Daniels County | 1646 |
| 50 | Garfield County | 1272 |
| 51 | Carter County | 1245 |
| 52 | Prairie County | 1064 |
| 53 | Wibaux County | 954 |
| 54 | Golden Valley County | 827 |
| 55 | Treasure County | 697 |
| 56 | Petroleum County | 497 |