Illinois Citizen Voting-age Population By County in 2016 (ACS-5Yrs)
Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2016, the citizen voting-age population for Illinois was 9,003,480 and represented 70.06% of the total Illinois population.
Among all Illinois counties, Cook had the highest citizen voting-age population (3.51M), followed by DuPage (641.45K), and Will (467.85K).
In terms of percentages, Brown had the highest percentage of its population being citizens of voting-age (83.32%), followed by Pope (82.49%), and Hardin (82.04%).
The chart and table below shows the citizen voting-age population of each county and the percentage of each county's population that were citizens of voting-age.
You can see similar information for other states and by state for the United States.
| County | Citizen Voting-age Population | % of County Population |
|---|---|---|
| Cook | 3511325 | 67.17 |
| DuPage | 641445 | 68.93 |
| Will | 467850 | 68.26 |
| Lake | 462020 | 65.73 |
| Kane | 328655 | 62.41 |
| McHenry | 217245 | 70.74 |
| Winnebago | 208965 | 72.33 |
| Madison | 204680 | 76.73 |
| St. Clair | 198690 | 74.82 |
| Champaign | 152000 | 73.64 |
| Sangamon | 150365 | 75.70 |
| Peoria | 136930 | 73.30 |
| McLean | 128105 | 73.94 |
| Rock Island | 107595 | 73.43 |
| Tazewell | 103210 | 76.23 |
| LaSalle | 85480 | 76.37 |
| Macon | 82940 | 76.51 |
| Kankakee | 81290 | 72.91 |
| Kendall | 80660 | 66.41 |
| DeKalb | 77625 | 74.31 |
| Vermilion | 59545 | 74.79 |
| Williamson | 51985 | 77.20 |
| Adams | 51395 | 76.77 |
| Jackson | 46120 | 77.92 |
| Whiteside | 43510 | 76.13 |
| Coles | 42505 | 80.50 |
| Knox | 40720 | 78.69 |
| Ogle | 38580 | 74.14 |
| Henry | 37600 | 75.68 |
| Grundy | 36790 | 73.08 |
| Macoupin | 36315 | 78.13 |
| Boone | 36300 | 67.65 |
| Stephenson | 35830 | 77.41 |
| Franklin | 30570 | 77.38 |
| Jefferson | 29855 | 77.50 |
| Clinton | 29535 | 78.01 |
| Marion | 29430 | 76.43 |
| Woodford | 29260 | 74.79 |
| Livingston | 28760 | 77.15 |
| Fulton | 28210 | 78.26 |
| Morgan | 27560 | 79.19 |
| Lee | 27215 | 78.38 |
| Christian | 26635 | 78.59 |
| Randolph | 26390 | 80.13 |
| Effingham | 25945 | 75.52 |
| Monroe | 25835 | 76.65 |
| McDonough | 25625 | 80.77 |
| Bureau | 25550 | 75.55 |
| Logan | 23970 | 80.38 |
| Montgomery | 23305 | 79.54 |
| Iroquois | 21870 | 75.90 |
| Saline | 19145 | 77.64 |
| Jo Daviess | 17600 | 79.33 |
| Jersey | 17495 | 77.96 |
| Perry | 17255 | 79.90 |
| Fayette | 17205 | 78.12 |
| Shelby | 17180 | 78.06 |
| Crawford | 15455 | 79.50 |
| Hancock | 14675 | 78.75 |
| Douglas | 14325 | 72.46 |
| Edgar | 13910 | 78.02 |
| Union | 13550 | 77.61 |
| Bond | 13460 | 78.55 |
| Lawrence | 13090 | 78.95 |
| Warren | 12915 | 73.34 |
| Wayne | 12735 | 77.11 |
| Piatt | 12645 | 76.78 |
| De Witt | 12635 | 77.42 |
| Pike | 12445 | 77.52 |
| Mercer | 12440 | 77.90 |
| Richland | 12355 | 76.88 |
| Clark | 12330 | 76.63 |
| Carroll | 11710 | 79.15 |
| Massac | 11585 | 77.83 |
| Washington | 11265 | 78.39 |
| White | 11175 | 77.55 |
| Moultrie | 11165 | 74.86 |
| Mason | 10935 | 78.50 |
| Ford | 10505 | 76.34 |
| Greene | 10470 | 78.19 |
| Johnson | 10460 | 81.31 |
| Clay | 10370 | 77.01 |
| Menard | 9705 | 77.18 |
| Marshall | 9535 | 79.06 |
| Cass | 8930 | 68.32 |
| Wabash | 8890 | 76.74 |
| Cumberland | 8350 | 76.68 |
| Jasper | 7350 | 76.64 |
| Hamilton | 6400 | 77.58 |
| Schuyler | 5805 | 80.57 |
| Brown | 5695 | 83.32 |
| Henderson | 5595 | 80.33 |
| Alexander | 5340 | 75.75 |
| Edwards | 5080 | 76.85 |
| Stark | 4595 | 78.68 |
| Putnam | 4495 | 78.24 |
| Pulaski | 4450 | 76.86 |
| Gallatin | 4175 | 78.40 |
| Scott | 3985 | 77.08 |
| Calhoun | 3900 | 78.63 |
| Pope | 3510 | 82.49 |
| Hardin | 3425 | 82.04 |
