Illinois Citizen Voting-age Population By County in 2015 (ACS-5Yrs)
Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2015, the citizen voting-age population for Illinois was 8,980,000 and represented 69.75% of the total Illinois population.
Among all Illinois counties, Cook had the highest citizen voting-age population (3.50M), followed by DuPage (638.72K), and Will (462.78K).
In terms of percentages, Pope had the highest percentage of its population being citizens of voting-age (83.49%), followed by Brown (82.80%), and McDonough (81.26%).
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 | 3499915 | 66.84 |
| DuPage | 638715 | 68.65 |
| Will | 462775 | 67.66 |
| Lake | 458405 | 65.22 |
| Kane | 323650 | 61.66 |
| McHenry | 215465 | 70.10 |
| Winnebago | 209050 | 71.98 |
| Madison | 204750 | 76.58 |
| St. Clair | 199135 | 74.57 |
| Champaign | 151420 | 73.59 |
| Sangamon | 150055 | 75.40 |
| Peoria | 137370 | 73.42 |
| McLean | 128185 | 74.05 |
| Rock Island | 107940 | 73.35 |
| Tazewell | 103375 | 76.18 |
| LaSalle | 85540 | 75.98 |
| Macon | 83405 | 76.38 |
| Kankakee | 81730 | 72.83 |
| Kendall | 79875 | 66.54 |
| DeKalb | 77120 | 73.91 |
| Vermilion | 60035 | 74.70 |
| Williamson | 51810 | 77.19 |
| Adams | 51385 | 76.60 |
| Jackson | 46465 | 78.05 |
| Whiteside | 43680 | 75.93 |
| Coles | 42810 | 80.72 |
| Knox | 40980 | 78.64 |
| Ogle | 38525 | 73.53 |
| Henry | 37815 | 75.80 |
| Grundy | 36635 | 72.87 |
| Macoupin | 36485 | 77.89 |
| Boone | 36355 | 67.51 |
| Stephenson | 36065 | 77.35 |
| Franklin | 30590 | 77.06 |
| Jefferson | 29935 | 77.59 |
| Marion | 29590 | 76.53 |
| Clinton | 29495 | 77.76 |
| Livingston | 29425 | 78.07 |
| Woodford | 29125 | 74.48 |
| Fulton | 28370 | 78.10 |
| Morgan | 27615 | 78.61 |
| Lee | 27350 | 78.09 |
| Christian | 26745 | 78.20 |
| Randolph | 26440 | 79.95 |
| McDonough | 26010 | 81.26 |
| Effingham | 25905 | 75.46 |
| Bureau | 25725 | 75.41 |
| Monroe | 25690 | 76.60 |
| Logan | 23905 | 79.80 |
| Montgomery | 23150 | 78.88 |
| Iroquois | 21975 | 75.63 |
| Saline | 19220 | 77.55 |
| Jo Daviess | 17685 | 78.97 |
| Jersey | 17535 | 77.50 |
| Perry | 17345 | 79.53 |
| Shelby | 17260 | 78.05 |
| Fayette | 17195 | 77.68 |
| Crawford | 15525 | 79.45 |
| Hancock | 14700 | 78.44 |
| Douglas | 14345 | 72.36 |
| Edgar | 14030 | 77.99 |
| Union | 13625 | 77.64 |
| Bond | 13540 | 78.20 |
| Lawrence | 13105 | 78.64 |
| Warren | 12980 | 73.33 |
| Wayne | 12745 | 76.99 |
| Piatt | 12685 | 76.90 |
| De Witt | 12665 | 77.27 |
| Mercer | 12510 | 77.68 |
| Pike | 12475 | 77.27 |
| Richland | 12445 | 77.18 |
| Clark | 12290 | 76.05 |
| Carroll | 11730 | 78.59 |
| Massac | 11645 | 77.56 |
| Washington | 11325 | 78.35 |
| White | 11230 | 77.64 |
| Moultrie | 11180 | 74.91 |
| Mason | 11040 | 78.16 |
| Ford | 10570 | 76.40 |
| Greene | 10525 | 77.96 |
| Clay | 10400 | 76.58 |
| Johnson | 10390 | 80.98 |
| Menard | 9715 | 77.04 |
| Marshall | 9575 | 78.65 |
| Cass | 9040 | 68.20 |
| Wabash | 8990 | 77.17 |
| Cumberland | 8340 | 76.20 |
| Jasper | 7370 | 76.49 |
| Hamilton | 6445 | 77.46 |
| Schuyler | 5830 | 79.75 |
| Brown | 5680 | 82.80 |
| Henderson | 5665 | 80.47 |
| Alexander | 5555 | 75.42 |
| Edwards | 5120 | 76.99 |
| Stark | 4585 | 78.24 |
| Putnam | 4535 | 77.92 |
| Pulaski | 4485 | 76.41 |
| Gallatin | 4275 | 79.39 |
| Scott | 3985 | 76.64 |
| Calhoun | 3930 | 78.60 |
| Pope | 3615 | 83.49 |
| Hardin | 3380 | 79.91 |
