Illinois Citizen Voting-age Population By County in 2020 (ACS-5Yrs)
Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2020, the citizen voting-age population for Illinois was 9,064,395 and represented 71.28% of the total Illinois population.
Among all Illinois counties, Cook had the highest citizen voting-age population (3.55M), followed by DuPage (649.27K), and Will (484.75K).
In terms of percentages, Hardin had the highest percentage of its population being citizens of voting-age (85.60%), followed by Pope (84.91%), and Schuyler (81.80%).
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 | 3550975 | 68.69 |
| DuPage | 649265 | 70.11 |
| Will | 484750 | 70.28 |
| Lake | 472690 | 67.56 |
| Kane | 350190 | 65.86 |
| McHenry | 223280 | 72.66 |
| Winnebago | 205155 | 72.33 |
| Madison | 204495 | 77.34 |
| St. Clair | 196265 | 75.14 |
| Champaign | 154155 | 73.41 |
| Sangamon | 149730 | 76.41 |
| Peoria | 133455 | 73.69 |
| McLean | 128985 | 74.92 |
| Rock Island | 105230 | 73.69 |
| Tazewell | 101375 | 76.50 |
| Kendall | 85595 | 67.09 |
| LaSalle | 83675 | 76.77 |
| Kankakee | 82045 | 74.64 |
| Macon | 80380 | 76.78 |
| DeKalb | 78165 | 74.74 |
| Vermilion | 57905 | 75.49 |
| Williamson | 51760 | 77.33 |
| Adams | 50580 | 77.02 |
| Jackson | 44850 | 77.98 |
| Whiteside | 42390 | 76.26 |
| Coles | 41365 | 81.01 |
| Knox | 39015 | 77.95 |
| Ogle | 38350 | 75.50 |
| Henry | 37760 | 77.01 |
| Boone | 37335 | 70.05 |
| Grundy | 37200 | 73.23 |
| Macoupin | 35470 | 78.40 |
| Stephenson | 34750 | 77.77 |
| Franklin | 29975 | 77.47 |
| Clinton | 29280 | 77.98 |
| Jefferson | 29180 | 77.25 |
| Woodford | 29005 | 75.33 |
| Marion | 28725 | 76.55 |
| Livingston | 27700 | 77.47 |
| Fulton | 27640 | 79.76 |
| Morgan | 27190 | 79.95 |
| Lee | 27035 | 79.04 |
| Monroe | 26695 | 77.50 |
| Christian | 25945 | 79.33 |
| Effingham | 25725 | 75.33 |
| Randolph | 25500 | 79.75 |
| Bureau | 25245 | 76.78 |
| McDonough | 24575 | 81.63 |
| Logan | 23050 | 79.98 |
| Montgomery | 22730 | 79.48 |
| Iroquois | 20990 | 76.51 |
| Saline | 18550 | 78.16 |
| Jersey | 17245 | 79.20 |
| Jo Daviess | 17130 | 79.94 |
| Perry | 16900 | 80.13 |
| Shelby | 16900 | 78.15 |
| Fayette | 16855 | 78.69 |
| Crawford | 15085 | 80.09 |
| Douglas | 14400 | 73.66 |
| Hancock | 14050 | 78.84 |
| Edgar | 13815 | 79.99 |
| Bond | 13245 | 80.18 |
| Union | 13090 | 77.78 |
| Warren | 12815 | 75.47 |
| Lawrence | 12685 | 80.13 |
| Piatt | 12630 | 76.97 |
| Wayne | 12550 | 76.95 |
| De Witt | 12205 | 77.42 |
| Mercer | 12070 | 77.85 |
| Pike | 12040 | 77.33 |
| Clark | 12025 | 77.08 |
| Richland | 11945 | 76.20 |
| Carroll | 11605 | 80.59 |
| Washington | 10965 | 78.52 |
| Massac | 10845 | 77.24 |
| Moultrie | 10815 | 74.30 |
| White | 10750 | 78.41 |
| Mason | 10680 | 79.20 |
| Greene | 10245 | 78.87 |
| Clay | 10190 | 77.11 |
| Ford | 10100 | 76.78 |
| Johnson | 10005 | 80.75 |
| Menard | 9475 | 77.28 |
| Marshall | 9110 | 78.81 |
| Wabash | 8755 | 76.87 |
| Cass | 8350 | 67.75 |
| Cumberland | 8300 | 76.96 |
| Jasper | 7300 | 76.48 |
| Hamilton | 6350 | 77.91 |
| Schuyler | 5640 | 81.80 |
| Henderson | 5485 | 81.44 |
| Brown | 5365 | 81.29 |
| Edwards | 4950 | 76.98 |
| Alexander | 4650 | 77.37 |
| Putnam | 4570 | 79.90 |
| Pulaski | 4235 | 78.21 |
| Stark | 4185 | 77.57 |
| Gallatin | 3930 | 78.84 |
| Scott | 3885 | 78.01 |
| Calhoun | 3790 | 79.29 |
| Pope | 3545 | 84.91 |
| Hardin | 3330 | 85.60 |
