Clay 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 13.31K Clay County, IL population, 4.86K had Unclassified ancestry (36.52%), 3.28K had German ancestry (24.60%), and 1.75K had American ancestry (13.15%).
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.
Clay County, IL Population By Ancestry in 2021
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| Ancestry | Population | Percent of Pop. (%) |
|---|---|---|
| Unclassified | 4862 | 36.52 |
| German | 3275 | 24.60 |
| American | 1750 | 13.15 |
| Other Groups | 1628 | 12.23 |
| Irish | 1591 | 11.95 |
| English | 982 | 7.38 |
| Polish | 288 | 2.16 |
| Dutch | 192 | 1.44 |
| Italian | 186 | 1.40 |
| Scandinavian | 185 | 1.39 |
| Scottish | 182 | 1.37 |
| Welsh | 105 | 0.79 |
| Northern European | 102 | 0.77 |
| French (except Basque) | 98 | 0.74 |
| European | 88 | 0.66 |
| British | 72 | 0.54 |
| Swedish | 71 | 0.53 |
| Scotch Irish | 66 | 0.50 |
| Danish | 20 | 0.15 |
| Swiss | 14 | 0.11 |
| Belgian | 12 | 0.09 |
| Norwegian | 11 | 0.08 |
| Celtic | 8 | 0.06 |
| Czech | 7 | 0.05 |
| Slovak | 6 | 0.05 |
| Greek | 5 | 0.04 |
| Czechoslovakian | 4 | 0.03 |
| Eastern European | 4 | 0.03 |
| Hungarian | 3 | 0.02 |
| Pennsylvania German | 3 | 0.02 |
| Russian | 2 | 0.02 |
| French Canadian | 1 | 0.01 |