Ranking of Montana Counties By Population with Unclassified Ancestry in 2021
Updated on April 16, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, there were 243.21K people in Montana with Unclassified ancestry. Among all Montana counties, Missoula County had the highest population with Unclassified ancestry (35.17K), followed by Yellowstone County (34.19K), and Gallatin County (25.63K).
The chart and table below shows the top 10 counties with high number of people with Unclassified 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 Unclassified Ancestry in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | Missoula County | 35170 |
| 2 | Yellowstone County | 34186 |
| 3 | Gallatin County | 25627 |
| 4 | Flathead County | 20789 |
| 5 | Cascade County | 18815 |
| 6 | Lewis and Clark County | 13467 |
| 7 | Ravalli County | 10719 |
| 8 | Silver Bow County | 9082 |
| 9 | Lake County | 8111 |
| 10 | Lincoln County | 5481 |
| 11 | Hill County | 5421 |
| 12 | Custer County | 3111 |
| 12 | Park County | 3111 |
| 13 | Sanders County | 2676 |
| 14 | Richland County | 2410 |
| 15 | Big Horn County | 2390 |
| 16 | Dawson County | 2306 |
| 17 | Fergus County | 2269 |
| 18 | Jefferson County | 2253 |
| 19 | Carbon County | 2197 |
| 20 | Deer Lodge County | 2151 |
| 21 | Beaverhead County | 2125 |
| 22 | Stillwater County | 1923 |
| 23 | Rosebud County | 1812 |
| 24 | Valley County | 1802 |
| 25 | Madison County | 1738 |
| 26 | Glacier County | 1542 |
| 27 | Pondera County | 1537 |
| 28 | Teton County | 1456 |
| 29 | Powell County | 1429 |
| 30 | Toole County | 1405 |
| 31 | Mineral County | 1397 |
| 32 | Roosevelt County | 1360 |
| 33 | Chouteau County | 1298 |
| 34 | Blaine County | 1283 |
| 35 | Broadwater County | 1186 |
| 36 | Musselshell County | 954 |
| 37 | Granite County | 827 |
| 38 | Sheridan County | 815 |
| 39 | Phillips County | 734 |
| 40 | Sweet Grass County | 650 |
| 41 | Liberty County | 488 |
| 42 | Fallon County | 464 |
| 43 | Meagher County | 444 |
| 44 | Powder River County | 373 |
| 45 | Daniels County | 363 |
| 46 | Carter County | 349 |
| 47 | Prairie County | 278 |
| 48 | Judith Basin County | 272 |
| 49 | McCone County | 248 |
| 50 | Wibaux County | 222 |
| 51 | Golden Valley County | 202 |
| 52 | Treasure County | 179 |
| 53 | Wheatland County | 138 |
| 54 | Garfield County | 118 |
| 55 | Petroleum County | 60 |
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