Ranking of Illinois Counties By 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. Among all Illinois counties, Cook County had the highest population with Czech ancestry (35.86K), followed by DuPage County (16.05K), and Will County (9.54K).
The chart and table below shows the top 10 counties with high number of people with 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 Population with Czech Ancestry in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | Cook County | 35858 |
| 2 | DuPage County | 16045 |
| 3 | Will County | 9535 |
| 4 | Lake County | 4946 |
| 5 | Kane County | 4296 |
| 6 | McHenry County | 3870 |
| 7 | Kendall County | 1681 |
| 8 | Madison County | 1352 |
| 9 | Winnebago County | 1174 |
| 10 | DeKalb County | 1028 |
| 11 | St. Clair County | 971 |
| 12 | Champaign County | 804 |
| 13 | LaSalle County | 794 |
| 14 | McLean County | 765 |
| 15 | Rock Island County | 730 |
| 16 | Sangamon County | 606 |
| 17 | Peoria County | 598 |
| 18 | Grundy County | 555 |
| 19 | Kankakee County | 516 |
| 20 | Boone County | 399 |
| 21 | Tazewell County | 337 |
| 22 | Livingston County | 314 |
| 23 | Stephenson County | 308 |
| 24 | Macon County | 294 |
| 25 | Jo Daviess County | 266 |
| 26 | Woodford County | 261 |
| 27 | Henry County | 250 |
| 28 | Monroe County | 223 |
| 28 | Whiteside County | 223 |
| 29 | Jackson County | 193 |
| 30 | Christian County | 170 |
| 31 | Coles County | 169 |
| 32 | Lee County | 141 |
| 33 | Bureau County | 136 |
| 34 | Ogle County | 135 |
| 35 | Bond County | 131 |
| 36 | Vermilion County | 113 |
| 37 | Piatt County | 108 |
| 38 | Knox County | 105 |
| 39 | Adams County | 103 |
| 39 | Logan County | 103 |
| 40 | Jefferson County | 101 |
| 41 | Marion County | 99 |
| 42 | Jersey County | 98 |
| 43 | Fulton County | 97 |
| 44 | Iroquois County | 92 |
| 44 | McDonough County | 92 |
| 45 | Ford County | 85 |
| 46 | Williamson County | 80 |
| 47 | Perry County | 77 |
| 48 | Mercer County | 75 |
| 49 | Crawford County | 72 |
| 50 | Moultrie County | 71 |
| 51 | Clark County | 69 |
| 52 | Montgomery County | 68 |
| 53 | Macoupin County | 67 |
| 54 | Carroll County | 56 |
| 55 | Morgan County | 52 |
| 56 | Clinton County | 51 |
| 57 | Washington County | 44 |
| 58 | Shelby County | 43 |
| 59 | Randolph County | 37 |
| 59 | Scott County | 37 |
| 60 | Marshall County | 36 |
| 61 | Hancock County | 35 |
| 61 | Union County | 35 |
| 62 | Menard County | 33 |
| 63 | Franklin County | 31 |
| 63 | Richland County | 31 |
| 64 | Saline County | 28 |
| 65 | Warren County | 22 |
| 66 | Calhoun County | 21 |
| 67 | Henderson County | 20 |
| 67 | Johnson County | 20 |
| 68 | Putnam County | 17 |
| 69 | Schuyler County | 16 |
| 70 | Lawrence County | 15 |
| 71 | Douglas County | 14 |
| 72 | Fayette County | 13 |
| 73 | Jasper County | 12 |
| 74 | Hamilton County | 11 |
| 75 | Massac County | 10 |
| 76 | De Witt County | 8 |
| 77 | Clay County | 7 |
| 77 | Effingham County | 7 |
| 77 | Mason County | 7 |
| 78 | Cumberland County | 6 |
| 78 | Edwards County | 6 |
| 78 | Greene County | 6 |
| 78 | Pike County | 6 |
| 79 | Pope County | 5 |
| 80 | Alexander County | 4 |
| 81 | Cass County | 2 |
| 81 | Wayne County | 2 |
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