Grundy 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 52.36K Grundy County, IL population, 12.86K had German ancestry (24.56%), 9.76K had Irish ancestry (18.64%), and 9.59K had Unclassified ancestry (18.32%).
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.
Grundy County, IL Population By Ancestry in 2021
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| Ancestry | Population | Percent of Pop. (%) |
|---|---|---|
| German | 12858 | 24.56 |
| Irish | 9761 | 18.64 |
| Unclassified | 9593 | 18.32 |
| Other Groups | 8662 | 16.54 |
| Italian | 6211 | 11.86 |
| English | 5391 | 10.30 |
| Polish | 5063 | 9.67 |
| Norwegian | 2931 | 5.60 |
| American | 1506 | 2.88 |
| French (except Basque) | 1291 | 2.47 |
| Swedish | 1013 | 1.94 |
| Scottish | 850 | 1.62 |
| Dutch | 806 | 1.54 |
| Lithuanian | 617 | 1.18 |
| Greek | 568 | 1.09 |
| Czech | 555 | 1.06 |
| Scotch Irish | 528 | 1.01 |
| Albania | 476 | 0.91 |
| European | 417 | 0.80 |
| Slovak | 377 | 0.72 |
| Croatian | 341 | 0.65 |
| Danish | 273 | 0.52 |
| British | 245 | 0.47 |
| Slovene | 164 | 0.31 |
| Hungarian | 159 | 0.30 |
| French Canadian | 126 | 0.24 |
| Belgian | 124 | 0.24 |
| Subsaharan African | 119 | 0.23 |
| Welsh | 112 | 0.21 |
| Swiss | 99 | 0.19 |
| Russian | 98 | 0.19 |
| African | 96 | 0.18 |
| Northern European | 94 | 0.18 |
| Czechoslovakian | 86 | 0.16 |
| Austrian | 78 | 0.15 |
| Eastern European | 75 | 0.14 |
| Ukrainian | 62 | 0.12 |
| Finnish | 60 | 0.12 |
| Scandinavian | 50 | 0.10 |
| Bulgarian | 47 | 0.09 |
| Slavic | 40 | 0.08 |
| West Indian (except Hispanic groups) | 37 | 0.07 |
| Yugoslavian | 33 | 0.06 |
| Haitian | 32 | 0.06 |
| Canadian | 26 | 0.05 |
| Latvian | 23 | 0.04 |
| Luxembourger | 20 | 0.04 |
| Palestinian | 17 | 0.03 |
| Ethiopian | 15 | 0.03 |
| Serbian | 14 | 0.03 |
| Romanian | 12 | 0.02 |
| Kenyan | 8 | 0.02 |
| Portuguese | 7 | 0.01 |
| Belizean | 5 | 0.01 |
| Lebanese | 3 | 0.01 |
| Syrian | 2 | 0.00 |
| Australian | 2 | 0.00 |
| Icelander | 2 | 0.00 |