Lewis and Clark County, MT Population By Ancestry in 2021 (ACS-5Yrs)
Updated on March 3, 2024.
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, and the table below shows both the number and percentages for all ancestry groups.
You can see similar information for other Montana counties, and for Montana.
Data Source: US Census - ACS 5-Year Estimates (2021).
Lewis and Clark County, MT Population By Ancestry in 2021
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| Ancestry | Number of Ancestry | Percentage of Population (%) |
|---|---|---|
| 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 |