Ranking of Montana Counties By Population with Irish Ancestry in 2021
Updated on April 16, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, there were 146.23K people in Montana with Irish ancestry. Among all Montana counties, Yellowstone County had the highest population with Irish ancestry (20.42K), followed by Missoula County (17.93K), and Gallatin County (16.62K).
The chart and table below shows the top 10 counties with high number of people with Irish 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 Irish Ancestry in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | Yellowstone County | 20418 |
| 2 | Missoula County | 17927 |
| 3 | Gallatin County | 16623 |
| 4 | Flathead County | 13964 |
| 5 | Lewis and Clark County | 11413 |
| 6 | Cascade County | 9770 |
| 7 | Silver Bow County | 8535 |
| 8 | Ravalli County | 5832 |
| 9 | Park County | 3076 |
| 10 | Lake County | 2867 |
| 11 | Jefferson County | 2295 |
| 12 | Lincoln County | 2272 |
| 13 | Deer Lodge County | 1960 |
| 14 | Custer County | 1599 |
| 15 | Powell County | 1561 |
| 16 | Richland County | 1463 |
| 17 | Sanders County | 1430 |
| 18 | Dawson County | 1426 |
| 19 | Beaverhead County | 1421 |
| 20 | Madison County | 1402 |
| 21 | Fergus County | 1294 |
| 22 | Stillwater County | 1283 |
| 23 | Hill County | 1256 |
| 24 | Broadwater County | 1158 |
| 25 | Carbon County | 1135 |
| 26 | Teton County | 1063 |
| 27 | Glacier County | 997 |
| 28 | Rosebud County | 879 |
| 29 | Mineral County | 695 |
| 30 | Valley County | 691 |
| 31 | Chouteau County | 670 |
| 32 | Fallon County | 657 |
| 33 | Toole County | 636 |
| 34 | Pondera County | 622 |
| 35 | Big Horn County | 616 |
| 36 | Musselshell County | 467 |
| 37 | Phillips County | 464 |
| 38 | Roosevelt County | 446 |
| 39 | Sweet Grass County | 434 |
| 40 | Granite County | 420 |
| 41 | Judith Basin County | 373 |
| 42 | Wheatland County | 330 |
| 43 | Blaine County | 296 |
| 44 | Meagher County | 292 |
| 45 | Sheridan County | 278 |
| 46 | Daniels County | 248 |
| 47 | Powder River County | 215 |
| 48 | Prairie County | 196 |
| 49 | McCone County | 176 |
| 50 | Carter County | 126 |
| 51 | Garfield County | 124 |
| 51 | Wibaux County | 124 |
| 52 | Liberty County | 111 |
| 53 | Golden Valley County | 92 |
| 54 | Treasure County | 84 |
| 55 | Petroleum County | 31 |
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