Williamson County, IL Population By Ancestry in 2021 (ACS-5Yrs)
Updated on March 3, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, among the 67.27K Williamson County, IL population, 23.52K had Unclassified ancestry (34.96%), 11.92K had Other Groups ancestry (17.72%), and 10.70K had German ancestry (15.91%).
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 Illinois counties, and for Illinois.
NB: People could belong to one or more ancestry groups.
Data Source: US Census Bureau.
Williamson County, IL Population By Ancestry in 2021
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| Ancestry | Population | Percent of Pop. (%) |
|---|---|---|
| Unclassified | 23519 | 34.96 |
| Other Groups | 11921 | 17.72 |
| German | 10700 | 15.91 |
| English | 8505 | 12.64 |
| Irish | 8345 | 12.41 |
| American | 4583 | 6.81 |
| Italian | 3401 | 5.06 |
| French (except Basque) | 1844 | 2.74 |
| Polish | 1531 | 2.28 |
| Scottish | 1244 | 1.85 |
| European | 976 | 1.45 |
| Welsh | 670 | 1.00 |
| Scotch Irish | 658 | 0.98 |
| Dutch | 614 | 0.91 |
| Swedish | 431 | 0.64 |
| Norwegian | 430 | 0.64 |
| British | 346 | 0.51 |
| Russian | 266 | 0.40 |
| Belgian | 241 | 0.36 |
| Danish | 172 | 0.26 |
| Swiss | 164 | 0.24 |
| Eastern European | 163 | 0.24 |
| Greek | 139 | 0.21 |
| Hungarian | 139 | 0.21 |
| Northern European | 119 | 0.18 |
| Scandinavian | 108 | 0.16 |
| Austrian | 104 | 0.16 |
| Ukrainian | 103 | 0.15 |
| Lithuanian | 99 | 0.15 |
| Croatian | 95 | 0.14 |
| Czech | 80 | 0.12 |
| Portuguese | 69 | 0.10 |
| Czechoslovakian | 48 | 0.07 |
| Canadian | 46 | 0.07 |
| Slavic | 46 | 0.07 |
| French Canadian | 42 | 0.06 |
| Pennsylvania German | 42 | 0.06 |
| Yugoslavian | 33 | 0.05 |
| Finnish | 26 | 0.04 |
| Palestinian | 22 | 0.03 |
| Serbian | 21 | 0.03 |
| Subsaharan African | 18 | 0.03 |
| Maltese | 17 | 0.03 |
| West Indian (except Hispanic groups) | 16 | 0.02 |
| Jamaican | 16 | 0.02 |
| Iranian | 12 | 0.02 |
| African | 12 | 0.02 |
| Slovak | 11 | 0.02 |
| Slovene | 7 | 0.01 |
| Brazilian | 2 | 0.00 |
| Macedonian | 2 | 0.00 |