Lewis and Clark 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 70.34K Lewis and Clark County, MT population, 18.18K had German ancestry (25.84%), 13.47K had Unclassified ancestry (19.15%), and 11.41K had Irish ancestry (16.23%).
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.
Lewis and Clark County, MT Population By Ancestry in 2021
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| Ancestry | Population | Percent of Pop. (%) |
|---|---|---|
| German | 18176 | 25.84 |
| Unclassified | 13467 | 19.15 |
| Irish | 11413 | 16.23 |
| English | 10460 | 14.87 |
| Other Groups | 9437 | 13.42 |
| Norwegian | 5972 | 8.49 |
| American | 3625 | 5.15 |
| Swedish | 2774 | 3.94 |
| Italian | 2715 | 3.86 |
| French (except Basque) | 2416 | 3.44 |
| Scottish | 2162 | 3.07 |
| European | 1836 | 2.61 |
| Polish | 1686 | 2.40 |
| Dutch | 1421 | 2.02 |
| Scotch Irish | 1270 | 1.81 |
| Scandinavian | 1034 | 1.47 |
| Welsh | 1032 | 1.47 |
| British | 684 | 0.97 |
| Russian | 617 | 0.88 |
| Danish | 532 | 0.76 |
| Finnish | 531 | 0.76 |
| Northern European | 516 | 0.73 |
| French Canadian | 484 | 0.69 |
| Czech | 389 | 0.55 |
| Austrian | 378 | 0.54 |
| Eastern European | 336 | 0.48 |
| Swiss | 334 | 0.48 |
| Croatian | 292 | 0.42 |
| Ukrainian | 273 | 0.39 |
| Belgian | 250 | 0.36 |
| Hungarian | 217 | 0.31 |
| Greek | 207 | 0.29 |
| Czechoslovakian | 173 | 0.25 |
| Romanian | 172 | 0.25 |
| German Russian | 136 | 0.19 |
| Portuguese | 127 | 0.18 |
| Lebanese | 115 | 0.16 |
| Slovene | 115 | 0.16 |
| West Indian (except Hispanic groups) | 112 | 0.16 |
| Lithuanian | 110 | 0.16 |
| Yugoslavian | 99 | 0.14 |
| Basque | 93 | 0.13 |
| Slavic | 93 | 0.13 |
| West Indian | 77 | 0.11 |
| Canadian | 71 | 0.10 |
| Slovak | 64 | 0.09 |
| Celtic | 45 | 0.06 |
| Luxembourger | 42 | 0.06 |
| Armenian | 35 | 0.05 |
| Brazilian | 28 | 0.04 |
| Pennsylvania German | 25 | 0.04 |
| Jamaican | 25 | 0.04 |
| Iranian | 16 | 0.02 |
| Subsaharan African | 16 | 0.02 |
| Icelander | 15 | 0.02 |
| Bulgarian | 14 | 0.02 |
| Latvian | 12 | 0.02 |
| Macedonian | 10 | 0.01 |
| Trinidadian and Tobagonian | 10 | 0.01 |
| Ethiopian | 9 | 0.01 |
| African | 7 | 0.01 |
| Serbian | 5 | 0.01 |
| Australian | 3 | 0.00 |