Ranking of Montana Counties By Population with American Ancestry in 2021
Updated on April 16, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, there were 52.83K people in Montana with American ancestry. Among all Montana counties, Yellowstone County had the highest population with American ancestry (7.44K), followed by Cascade County (7.16K), and Gallatin County (4.49K).
The chart and table below shows the top 10 counties with high number of people with American ancestry.
You can see similar information for other states and for other ancestry groups in Montana.
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Related Topics: Montana ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census Bureau.
Ranking of Montana Counties By Population with American Ancestry in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | Yellowstone County | 7435 |
| 2 | Cascade County | 7159 |
| 3 | Gallatin County | 4486 |
| 4 | Flathead County | 4360 |
| 5 | Missoula County | 4130 |
| 6 | Lewis and Clark County | 3625 |
| 7 | Lake County | 1647 |
| 8 | Fergus County | 1522 |
| 9 | Ravalli County | 1510 |
| 10 | Sanders County | 1178 |
| 11 | Hill County | 1021 |
| 12 | Silver Bow County | 911 |
| 13 | Valley County | 791 |
| 14 | Lincoln County | 746 |
| 15 | Carbon County | 728 |
| 16 | Musselshell County | 673 |
| 17 | Phillips County | 662 |
| 18 | Chouteau County | 651 |
| 19 | Richland County | 640 |
| 20 | Beaverhead County | 546 |
| 21 | Deer Lodge County | 539 |
| 22 | Park County | 522 |
| 23 | Custer County | 475 |
| 24 | Wheatland County | 462 |
| 25 | Stillwater County | 442 |
| 26 | Powell County | 434 |
| 27 | Jefferson County | 430 |
| 28 | Teton County | 400 |
| 29 | Blaine County | 352 |
| 30 | Roosevelt County | 339 |
| 31 | Garfield County | 321 |
| 32 | Big Horn County | 312 |
| 33 | Judith Basin County | 303 |
| 34 | Rosebud County | 293 |
| 35 | Madison County | 282 |
| 36 | Broadwater County | 271 |
| 37 | Pondera County | 222 |
| 38 | Sheridan County | 216 |
| 39 | Dawson County | 209 |
| 40 | Granite County | 177 |
| 40 | McCone County | 177 |
| 41 | Glacier County | 175 |
| 42 | Daniels County | 150 |
| 43 | Mineral County | 146 |
| 44 | Toole County | 128 |
| 45 | Carter County | 119 |
| 46 | Petroleum County | 102 |
| 47 | Powder River County | 94 |
| 48 | Sweet Grass County | 59 |
| 49 | Golden Valley County | 51 |
| 50 | Liberty County | 50 |
| 51 | Treasure County | 42 |
| 52 | Meagher County | 34 |
| 52 | Prairie County | 34 |
| 53 | Wibaux County | 30 |
| 54 | Fallon County | 14 |
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