Custer County, SD Population By Ancestry in 2021 (ACS-5Yrs)
Updated on March 3, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, among the 8.36K Custer County, SD population, 2.92K had German ancestry (34.90%), 1.58K had Unclassified ancestry (18.85%), and 1.27K had Irish ancestry (15.23%).
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 South Dakota counties, and for South Dakota.
NB: People could belong to one or more ancestry groups.
Data Source: US Census Bureau.
Custer County, SD Population By Ancestry in 2021
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| Ancestry | Population | Percent of Pop. (%) |
|---|---|---|
| German | 2918 | 34.90 |
| Unclassified | 1576 | 18.85 |
| Irish | 1273 | 15.23 |
| Other Groups | 1048 | 12.54 |
| English | 855 | 10.23 |
| Norwegian | 817 | 9.77 |
| Swedish | 402 | 4.81 |
| Dutch | 390 | 4.67 |
| French (except Basque) | 293 | 3.51 |
| American | 270 | 3.23 |
| European | 262 | 3.13 |
| Danish | 249 | 2.98 |
| Scottish | 195 | 2.33 |
| Polish | 186 | 2.23 |
| Czech | 135 | 1.62 |
| Russian | 134 | 1.60 |
| Italian | 126 | 1.51 |
| Finnish | 118 | 1.41 |
| Scandinavian | 105 | 1.26 |
| Canadian | 77 | 0.92 |
| British | 55 | 0.66 |
| Hungarian | 52 | 0.62 |
| Scotch Irish | 38 | 0.46 |
| Swiss | 33 | 0.40 |
| Welsh | 31 | 0.37 |
| Portuguese | 20 | 0.24 |
| Eastern European | 14 | 0.17 |
| French Canadian | 13 | 0.16 |
| Czechoslovakian | 10 | 0.12 |
| Austrian | 8 | 0.10 |
| Ukrainian | 6 | 0.07 |
| Basque | 5 | 0.06 |
| Slavic | 4 | 0.05 |
| Subsaharan African | 2 | 0.02 |
| Iranian | 1 | 0.01 |