Ranking of Illinois Counties By Percentage of Population with Celtic Ancestry in 2021
Updated on April 16, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, there were 778 people in Illinois with Celtic ancestry (0.01% of Illinois population). Among all Illinois counties, Clay County had the highest percentage of its population with Celtic ancestry (0.06%), followed by Effingham County (0.06%), and Ogle County (0.04%).
The chart and table below shows the top 10 counties with high percentage of its population having Celtic ancestry.
You can see similar information for other states and for other ancestry groups in Illinois.
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Related Topics: Illinois ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census Bureau.
Ranking of Illinois Counties By Percentage of Population with Celtic Ancestry in 2021
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| Rank | County | Percentage of Pop. (%) |
|---|---|---|
| 1 | Clay County | 0.06 |
| 1 | Effingham County | 0.06 |
| 2 | Ogle County | 0.04 |
| 3 | Wayne County | 0.03 |
| 3 | Woodford County | 0.03 |
| 4 | De Witt County | 0.02 |
| 4 | St. Clair County | 0.02 |
| 4 | Winnebago County | 0.02 |
| 5 | Bureau County | 0.01 |
| 5 | Cook County | 0.01 |
| 5 | DuPage County | 0.01 |
| 5 | Henry County | 0.01 |
| 5 | Kankakee County | 0.01 |
| 5 | McHenry County | 0.01 |
| 5 | McLean County | 0.01 |
| 5 | Macon County | 0.01 |
| 5 | Madison County | 0.01 |
| 5 | Will County | 0.01 |
| 6 | Peoria County | 0.004 |
| 6 | Vermilion County | 0.004 |
| 7 | Adams County | 0.003 |
| 8 | Jackson County | 0.002 |
| 8 | Kane County | 0.002 |
| 8 | Sangamon County | 0.002 |
| 9 | Lake County | 0.001 |
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