Ranking of Illinois Counties By 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. Among all Illinois counties, Cook County had the highest population with Unclassified ancestry (830.05K), followed by DuPage County (148.82K), and Lake County (130.24K).
The chart and table below shows the top 10 counties with high number of people with 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 Population with Unclassified Ancestry in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | Cook County | 830054 |
| 2 | DuPage County | 148818 |
| 3 | Lake County | 130243 |
| 4 | Will County | 126038 |
| 5 | Kane County | 99890 |
| 6 | Madison County | 71745 |
| 7 | St. Clair County | 64274 |
| 8 | McHenry County | 58002 |
| 9 | Winnebago County | 57864 |
| 10 | Champaign County | 55016 |
| 11 | Sangamon County | 53229 |
| 12 | Peoria County | 48876 |
| 13 | Rock Island County | 43478 |
| 14 | Tazewell County | 38550 |
| 15 | McLean County | 34825 |
| 16 | Kendall County | 32684 |
| 17 | Macon County | 28102 |
| 18 | Vermilion County | 26512 |
| 19 | LaSalle County | 24409 |
| 20 | Williamson County | 23519 |
| 21 | Kankakee County | 23025 |
| 22 | DeKalb County | 20964 |
| 23 | Adams County | 20163 |
| 24 | Jackson County | 17930 |
| 25 | Knox County | 16588 |
| 26 | Coles County | 15996 |
| 27 | Macoupin County | 15567 |
| 28 | Franklin County | 14338 |
| 29 | Christian County | 14225 |
| 30 | Jefferson County | 13795 |
| 31 | Whiteside County | 13703 |
| 32 | Henry County | 13641 |
| 33 | Marion County | 13337 |
| 34 | Ogle County | 13275 |
| 35 | Boone County | 11468 |
| 36 | Fulton County | 11240 |
| 37 | Stephenson County | 10984 |
| 38 | Morgan County | 10119 |
| 39 | Grundy County | 9593 |
| 40 | Montgomery County | 9542 |
| 41 | Woodford County | 9430 |
| 42 | Shelby County | 8941 |
| 43 | McDonough County | 8836 |
| 44 | Randolph County | 8766 |
| 45 | Bureau County | 8597 |
| 46 | Lee County | 8561 |
| 47 | Clinton County | 8402 |
| 48 | Saline County | 8132 |
| 49 | Livingston County | 7847 |
| 50 | Fayette County | 7655 |
| 51 | Monroe County | 7568 |
| 52 | Union County | 7479 |
| 53 | Effingham County | 7465 |
| 54 | Logan County | 7446 |
| 55 | Perry County | 7302 |
| 56 | Edgar County | 6501 |
| 57 | Crawford County | 6436 |
| 58 | Douglas County | 6429 |
| 59 | Iroquois County | 6407 |
| 60 | Mercer County | 6372 |
| 61 | Warren County | 6287 |
| 62 | Clark County | 6073 |
| 63 | Wayne County | 6056 |
| 64 | Jersey County | 5813 |
| 65 | Johnson County | 5684 |
| 66 | Lawrence County | 5662 |
| 67 | De Witt County | 5456 |
| 68 | Moultrie County | 5380 |
| 69 | Pike County | 5319 |
| 70 | Hancock County | 5314 |
| 71 | Massac County | 5193 |
| 72 | White County | 5140 |
| 73 | Piatt County | 5029 |
| 74 | Bond County | 5016 |
| 75 | Richland County | 5007 |
| 76 | Clay County | 4862 |
| 77 | Mason County | 4550 |
| 78 | Cass County | 3966 |
| 79 | Cumberland County | 3853 |
| 80 | Greene County | 3845 |
| 81 | Carroll County | 3842 |
| 82 | Menard County | 3819 |
| 83 | Ford County | 3711 |
| 84 | Jo Daviess County | 3408 |
| 85 | Wabash County | 3362 |
| 86 | Washington County | 3227 |
| 87 | Henderson County | 3163 |
| 88 | Jasper County | 3150 |
| 89 | Marshall County | 3043 |
| 90 | Hamilton County | 2746 |
| 91 | Edwards County | 2290 |
| 92 | Schuyler County | 2285 |
| 93 | Alexander County | 2094 |
| 94 | Gallatin County | 2079 |
| 95 | Pulaski County | 1678 |
| 96 | Brown County | 1673 |
| 97 | Pope County | 1609 |
| 98 | Stark County | 1579 |
| 99 | Hardin County | 1270 |
| 100 | Scott County | 1261 |
| 101 | Putnam County | 1101 |
| 102 | Calhoun County | 842 |
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