Ranking of Illinois Counties By Percentage of Population with Czech Ancestry in 2021
Updated on April 16, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, there were 92.66K people in Illinois with Czech ancestry (0.72% of Illinois population). Among all Illinois counties, DuPage County had the highest percentage of its population with Czech ancestry (1.72%), followed by Will County (1.37%), and Kendall County (1.29%).
The chart and table below shows the top 10 counties with high percentage of its population having Czech 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 Czech Ancestry in 2021
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| Rank | County | Percentage of Pop. (%) |
|---|---|---|
| 1 | DuPage County | 1.72 |
| 2 | Will County | 1.37 |
| 3 | Kendall County | 1.29 |
| 4 | McHenry County | 1.25 |
| 5 | Jo Daviess County | 1.21 |
| 6 | Grundy County | 1.06 |
| 7 | DeKalb County | 1.02 |
| 8 | Livingston County | 0.88 |
| 9 | Kane County | 0.83 |
| 10 | Bond County | 0.78 |
| 11 | Boone County | 0.75 |
| 11 | Scott County | 0.75 |
| 12 | LaSalle County | 0.72 |
| 13 | Lake County | 0.69 |
| 13 | Stephenson County | 0.69 |
| 14 | Cook County | 0.68 |
| 14 | Woodford County | 0.68 |
| 15 | Piatt County | 0.65 |
| 16 | Monroe County | 0.64 |
| 17 | Ford County | 0.63 |
| 18 | Henry County | 0.51 |
| 18 | Madison County | 0.51 |
| 18 | Rock Island County | 0.51 |
| 19 | Christian County | 0.50 |
| 20 | Moultrie County | 0.49 |
| 21 | Kankakee County | 0.48 |
| 21 | Mercer County | 0.48 |
| 22 | Calhoun County | 0.46 |
| 22 | Jersey County | 0.46 |
| 23 | McLean County | 0.45 |
| 24 | Clark County | 0.44 |
| 25 | Bureau County | 0.41 |
| 25 | Lee County | 0.41 |
| 25 | Winnebago County | 0.41 |
| 26 | Whiteside County | 0.40 |
| 27 | Champaign County | 0.39 |
| 28 | Crawford County | 0.38 |
| 28 | St. Clair County | 0.38 |
| 29 | Logan County | 0.37 |
| 30 | Carroll County | 0.36 |
| 30 | Coles County | 0.36 |
| 30 | Jackson County | 0.36 |
| 30 | Perry County | 0.36 |
| 31 | Iroquois County | 0.34 |
| 32 | McDonough County | 0.33 |
| 32 | Peoria County | 0.33 |
| 33 | Washington County | 0.32 |
| 34 | Henderson County | 0.31 |
| 34 | Marshall County | 0.31 |
| 34 | Sangamon County | 0.31 |
| 35 | Putnam County | 0.30 |
| 36 | Fulton County | 0.28 |
| 36 | Macon County | 0.28 |
| 37 | Jefferson County | 0.27 |
| 37 | Menard County | 0.27 |
| 38 | Marion County | 0.26 |
| 38 | Ogle County | 0.26 |
| 38 | Tazewell County | 0.26 |
| 39 | Montgomery County | 0.24 |
| 40 | Schuyler County | 0.23 |
| 41 | Knox County | 0.21 |
| 42 | Hancock County | 0.20 |
| 42 | Richland County | 0.20 |
| 42 | Shelby County | 0.20 |
| 42 | Union County | 0.20 |
| 43 | Adams County | 0.16 |
| 43 | Morgan County | 0.16 |
| 44 | Johnson County | 0.15 |
| 44 | Macoupin County | 0.15 |
| 44 | Vermilion County | 0.15 |
| 45 | Clinton County | 0.14 |
| 45 | Hamilton County | 0.14 |
| 46 | Jasper County | 0.13 |
| 46 | Pope County | 0.13 |
| 46 | Warren County | 0.13 |
| 47 | Randolph County | 0.12 |
| 47 | Saline County | 0.12 |
| 47 | Williamson County | 0.12 |
| 48 | Edwards County | 0.10 |
| 48 | Lawrence County | 0.10 |
| 49 | Franklin County | 0.08 |
| 50 | Alexander County | 0.07 |
| 50 | Douglas County | 0.07 |
| 50 | Massac County | 0.07 |
| 51 | Cumberland County | 0.06 |
| 51 | Fayette County | 0.06 |
| 52 | Clay County | 0.05 |
| 52 | De Witt County | 0.05 |
| 52 | Greene County | 0.05 |
| 52 | Mason County | 0.05 |
| 53 | Pike County | 0.04 |
| 54 | Cass County | 0.02 |
| 54 | Effingham County | 0.02 |
| 55 | Wayne County | 0.01 |
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