Stillwater County, MT Population By Ancestry in 2021 (ACS-5Yrs)
Updated on March 3, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, among the 8.92K Stillwater County, MT population, 2.53K had German ancestry (28.38%), 1.92K had Unclassified ancestry (21.57%), and 1.28K had Irish ancestry (14.39%).
The chart below shows the top 10 ancestry groups by percentage, and the table below shows both the population and percentages for many ancestry groups.
You can see similar information for other Montana counties, and for Montana.
NB: People could belong to one or more ancestry groups.
Data Source: US Census Bureau.
Stillwater County, MT Population By Ancestry in 2021
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| Ancestry | Population | Percent of Pop. (%) |
|---|---|---|
| German | 2530 | 28.38 |
| Unclassified | 1923 | 21.57 |
| Irish | 1283 | 14.39 |
| Other Groups | 1205 | 13.52 |
| English | 1016 | 11.40 |
| Norwegian | 846 | 9.49 |
| American | 442 | 4.96 |
| French (except Basque) | 263 | 2.95 |
| Scotch Irish | 263 | 2.95 |
| Italian | 239 | 2.68 |
| Scottish | 235 | 2.64 |
| Dutch | 153 | 1.72 |
| Swedish | 151 | 1.69 |
| Scandinavian | 121 | 1.36 |
| Polish | 116 | 1.30 |
| Russian | 115 | 1.29 |
| Finnish | 112 | 1.26 |
| Croatian | 109 | 1.22 |
| European | 102 | 1.14 |
| Welsh | 97 | 1.09 |
| Danish | 77 | 0.86 |
| Iranian | 77 | 0.86 |
| Czech | 71 | 0.80 |
| Subsaharan African | 57 | 0.64 |
| African | 57 | 0.64 |
| British | 52 | 0.58 |
| Swiss | 52 | 0.58 |
| Austrian | 46 | 0.52 |
| French Canadian | 39 | 0.44 |
| Hungarian | 30 | 0.34 |
| Northern European | 25 | 0.28 |
| Canadian | 17 | 0.19 |
| Czechoslovakian | 15 | 0.17 |
| Portuguese | 14 | 0.16 |
| Slovak | 13 | 0.15 |
| Belgian | 12 | 0.14 |
| Basque | 11 | 0.12 |
| Yugoslavian | 11 | 0.12 |
| Eastern European | 7 | 0.08 |
| German Russian | 5 | 0.06 |
| Greek | 3 | 0.03 |
| Slovene | 2 | 0.02 |
| Ukrainian | 2 | 0.02 |