Ranking of Illinois Counties By Percentage of Population with Unclassified Ancestry in 2021
Updated on April 16, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, there were 2.60M people in Illinois with Unclassified ancestry (20.25% of Illinois population). Among all Illinois counties, Henderson County had the highest percentage of its population with Unclassified ancestry (48.77%), followed by Union County (43.33%), and Johnson County (42.94%).
The chart and table below shows the top 10 counties with high percentage of its population having Unclassified 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 Unclassified Ancestry in 2021
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| Rank | County | Percentage of Pop. (%) |
|---|---|---|
| 1 | Henderson County | 48.77 |
| 2 | Union County | 43.33 |
| 3 | Johnson County | 42.94 |
| 4 | Shelby County | 42.25 |
| 5 | Pope County | 42.12 |
| 6 | Christian County | 41.79 |
| 7 | Gallatin County | 41.27 |
| 8 | Mercer County | 40.38 |
| 9 | Clark County | 38.96 |
| 10 | Edgar County | 38.25 |
| 11 | Alexander County | 38.16 |
| 12 | Franklin County | 37.66 |
| 13 | Wayne County | 37.27 |
| 14 | Warren County | 37.23 |
| 15 | Jefferson County | 36.92 |
| 16 | White County | 36.82 |
| 17 | Moultrie County | 36.76 |
| 18 | Edwards County | 36.74 |
| 19 | Lawrence County | 36.61 |
| 20 | Cumberland County | 36.60 |
| 21 | Clay County | 36.52 |
| 22 | Massac County | 36.37 |
| 23 | Pike County | 35.64 |
| 24 | Fayette County | 35.58 |
| 25 | Vermilion County | 35.37 |
| 26 | Marion County | 35.30 |
| 27 | Williamson County | 34.96 |
| 28 | De Witt County | 34.86 |
| 29 | Perry County | 34.51 |
| 30 | Macoupin County | 34.48 |
| 31 | Mason County | 34.41 |
| 32 | Hardin County | 34.32 |
| 33 | Hamilton County | 34.24 |
| 34 | Crawford County | 34.19 |
| 35 | Saline County | 34.07 |
| 36 | Jasper County | 33.78 |
| 37 | Coles County | 33.65 |
| 38 | Montgomery County | 33.50 |
| 39 | Jackson County | 33.40 |
| 40 | Knox County | 33.05 |
| 41 | Fulton County | 33.04 |
| 42 | Schuyler County | 32.86 |
| 43 | Douglas County | 32.62 |
| 44 | McDonough County | 31.85 |
| 45 | Pulaski County | 31.79 |
| 46 | Greene County | 31.55 |
| 47 | Richland County | 31.54 |
| 48 | Menard County | 30.94 |
| 49 | Adams County | 30.61 |
| 50 | Morgan County | 30.49 |
| 51 | Cass County | 30.37 |
| 52 | Piatt County | 30.18 |
| 53 | Rock Island County | 30.05 |
| 54 | Hancock County | 29.94 |
| 55 | Bond County | 29.85 |
| 56 | Wabash County | 29.46 |
| 57 | Tazewell County | 29.21 |
| 58 | Stark County | 29.05 |
| 59 | Randolph County | 28.62 |
| 60 | Henry County | 27.61 |
| 61 | Ford County | 27.31 |
| 62 | Sangamon County | 27.05 |
| 63 | Jersey County | 27.00 |
| 64 | Madison County | 26.96 |
| 65 | Macon County | 26.94 |
| 66 | Peoria County | 26.79 |
| 67 | Champaign County | 26.63 |
| 68 | Brown County | 26.43 |
| 69 | Logan County | 26.37 |
| 70 | Marshall County | 25.83 |
| 71 | Bureau County | 25.79 |
| 72 | Ogle County | 25.63 |
| 73 | Scott County | 25.61 |
| 74 | Kendall County | 25.00 |
| 75 | Lee County | 24.91 |
| 76 | St. Clair County | 24.86 |
| 77 | Carroll County | 24.65 |
| 78 | Stephenson County | 24.51 |
| 79 | Whiteside County | 24.50 |
| 80 | Woodford County | 24.45 |
| 81 | Iroquois County | 23.42 |
| 82 | Washington County | 23.34 |
| 83 | Clinton County | 22.68 |
| 84 | LaSalle County | 22.19 |
| 85 | Livingston County | 21.86 |
| 86 | Monroe County | 21.79 |
| 87 | Effingham County | 21.59 |
| 88 | Boone County | 21.40 |
| 89 | Kankakee County | 21.30 |
| 90 | DeKalb County | 20.77 |
| 91 | McLean County | 20.31 |
| 92 | Winnebago County | 20.27 |
| 93 | Putnam County | 19.53 |
| 94 | Kane County | 19.26 |
| 95 | McHenry County | 18.67 |
| 96 | Calhoun County | 18.56 |
| 97 | Grundy County | 18.32 |
| 98 | Lake County | 18.23 |
| 99 | Will County | 18.10 |
| 100 | DuPage County | 15.93 |
| 101 | Cook County | 15.76 |
| 102 | Jo Daviess County | 15.49 |
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