Ranking of Illinois Counties By Voting-age Population Percentage from Census 2020
Updated on August 22, 2023.
According to the data from the US 2020 Census, as at April 2020, Johnson County had the highest voting-age population percentage in Illinois (82.64%), followed by Brown County (82.58%), and Carroll County (81.97%).
The chart below shows the top 10 counties with high voting-age population percentage, and the table below shows the ranking of all Illinois counties based on the percentage of the population that were in the voting-age (18 years and over) group.
You can also see the ranking of counties by population for other states as well as for the whole United States.
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Related Topics: Illinois Census 2020 Topic List.
Data Source: US Census Bureau, 2020 Census.
Ranking of Illinois Counties By Voting-age Population Percentage from Census 2020
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| Rank | County | % of County Voting-age Population |
|---|---|---|
| 1 | Johnson County | 82.64 |
| 2 | Brown County | 82.58 |
| 3 | Carroll County | 81.97 |
| 4 | McDonough County | 81.83 |
| 5 | Hardin County | 81.80 |
| 6 | Bond County | 81.76 |
| 7 | Pope County | 81.53 |
| 8 | Schuyler County | 81.44 |
| 9 | Henderson County | 81.18 |
| 10 | Alexander County | 80.88 |
| 11 | Champaign County | 80.84 |
| 12 | Jo Daviess County | 80.83 |
| 13 | Putnam County | 80.81 |
| 14 | Lawrence County | 80.72 |
| 15 | Jackson County | 80.69 |
| 16 | Perry County | 80.56 |
| 17 | Logan County | 80.53 |
| 18 | Coles County | 80.50 |
| 19 | Fulton County | 80.26 |
| 19 | Lee County | 80.26 |
| 19 | Morgan County | 80.26 |
| 20 | Randolph County | 80.23 |
| 21 | Knox County | 80.11 |
| 22 | Christian County | 79.98 |
| 23 | Crawford County | 79.72 |
| 24 | Mason County | 79.70 |
| 25 | Calhoun County | 79.67 |
| 26 | Union County | 79.63 |
| 27 | Montgomery County | 79.62 |
| 28 | Jersey County | 79.48 |
| 29 | Pulaski County | 79.47 |
| 30 | Gallatin County | 79.46 |
| 31 | Edgar County | 79.41 |
| 32 | Fayette County | 79.31 |
| 33 | Marshall County | 79.25 |
| 34 | White County | 79.22 |
| 35 | Macoupin County | 79.15 |
| 36 | Cook County | 79.09 |
| 37 | LaSalle County | 78.90 |
| 38 | Bureau County | 78.85 |
| 39 | Stephenson County | 78.72 |
| 39 | Warren County | 78.72 |
| 40 | Hancock County | 78.71 |
| 40 | Washington County | 78.71 |
| 41 | Shelby County | 78.68 |
| 42 | Madison County | 78.67 |
| 43 | Franklin County | 78.55 |
| 44 | De Witt County | 78.53 |
| 45 | McLean County | 78.46 |
| 46 | Whiteside County | 78.32 |
| 47 | Mercer County | 78.28 |
| 48 | Williamson County | 78.23 |
| 49 | Clinton County | 78.20 |
| 50 | Scott County | 78.12 |
| 51 | Stark County | 78.09 |
| 52 | Livingston County | 78.08 |
| 53 | Sangamon County | 78.02 |
| 53 | Wabash County | 78.02 |
| 54 | Iroquois County | 77.97 |
| 55 | Rock Island County | 77.90 |
| 56 | Macon County | 77.85 |
| 57 | Piatt County | 77.74 |
| 58 | Jefferson County | 77.72 |
| 59 | Saline County | 77.71 |
| 60 | Greene County | 77.69 |
| 61 | DuPage County | 77.65 |
| 62 | Adams County | 77.63 |
| 62 | Jasper County | 77.63 |
| 63 | Clark County | 77.60 |
| 64 | Ford County | 77.59 |
| 65 | DeKalb County | 77.56 |
| 66 | Richland County | 77.44 |
| 67 | Tazewell County | 77.33 |
| 68 | Menard County | 77.31 |
| 69 | Massac County | 77.30 |
| 70 | Pike County | 77.29 |
| 71 | Hamilton County | 77.28 |
| 72 | Marion County | 77.25 |
| 73 | Monroe County | 77.22 |
| 74 | Ogle County | 77.21 |
| 75 | Henry County | 77.20 |
| 76 | Kankakee County | 77.17 |
| 77 | Cumberland County | 77.15 |
| 78 | Vermilion County | 77.12 |
| 79 | Winnebago County | 77.11 |
| 80 | Clay County | 77.10 |
| 81 | Edwards County | 77.09 |
| 82 | McHenry County | 77.00 |
| 83 | Peoria County | 76.82 |
| 84 | Wayne County | 76.72 |
| 85 | Effingham County | 76.68 |
| 86 | St. Clair County | 76.57 |
| 87 | Lake County | 76.16 |
| 88 | Will County | 75.55 |
| 89 | Woodford County | 75.39 |
| 90 | Cass County | 75.34 |
| 91 | Moultrie County | 75.33 |
| 92 | Kane County | 75.28 |
| 93 | Douglas County | 75.24 |
| 94 | Boone County | 75.03 |
| 95 | Grundy County | 74.97 |
| 96 | Kendall County | 71.25 |