Illinois Citizen Voting-age Population By County in 2018 (ACS-5Yrs)
Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2018, the citizen voting-age population for Illinois was 9,055,185 and represented 70.63% of the total Illinois population.
Among all Illinois counties, Cook had the highest citizen voting-age population (3.55M), followed by DuPage (648.09K), and Will (476.82K).
In terms of percentages, Pope had the highest percentage of its population being citizens of voting-age (85.29%), followed by Brown (82.62%), and Hardin (82.29%).
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 | 3546040 | 67.88 |
| DuPage | 648085 | 69.56 |
| Will | 476820 | 69.24 |
| Lake | 468730 | 66.62 |
| Kane | 340090 | 64.07 |
| McHenry | 221100 | 71.83 |
| Winnebago | 207450 | 72.49 |
| Madison | 204505 | 76.98 |
| St. Clair | 197310 | 74.89 |
| Champaign | 153590 | 73.33 |
| Sangamon | 150110 | 75.94 |
| Peoria | 135365 | 73.38 |
| McLean | 128600 | 74.24 |
| Rock Island | 106600 | 73.38 |
| Tazewell | 102035 | 76.23 |
| LaSalle | 84475 | 76.52 |
| Kendall | 83665 | 67.13 |
| Kankakee | 82235 | 74.05 |
| Macon | 81750 | 76.75 |
| DeKalb | 77005 | 73.90 |
| Vermilion | 58850 | 75.06 |
| Williamson | 52110 | 77.43 |
| Adams | 51125 | 76.97 |
| Jackson | 45870 | 78.34 |
| Whiteside | 42890 | 76.05 |
| Coles | 41635 | 80.48 |
| Knox | 40030 | 78.49 |
| Ogle | 38295 | 74.61 |
| Henry | 37845 | 76.51 |
| Grundy | 36995 | 73.24 |
| Boone | 36820 | 68.69 |
| Macoupin | 35815 | 78.34 |
| Stephenson | 35160 | 77.39 |
| Franklin | 30275 | 77.38 |
| Jefferson | 29460 | 77.18 |
| Clinton | 29300 | 77.86 |
| Woodford | 29190 | 75.20 |
| Marion | 29100 | 76.41 |
| Livingston | 28040 | 77.19 |
| Fulton | 27900 | 78.77 |
| Morgan | 27570 | 80.09 |
| Lee | 27185 | 78.74 |
| Christian | 26195 | 78.83 |
| Monroe | 26100 | 76.91 |
| Randolph | 25960 | 79.77 |
| Effingham | 25745 | 75.33 |
| Bureau | 25405 | 76.11 |
| McDonough | 24995 | 80.96 |
| Logan | 23325 | 79.87 |
| Montgomery | 23165 | 79.85 |
| Iroquois | 21510 | 76.36 |
| Saline | 18910 | 78.04 |
| Jo Daviess | 17390 | 79.64 |
| Jersey | 17265 | 78.23 |
| Perry | 17190 | 80.38 |
| Fayette | 17140 | 78.90 |
| Shelby | 17120 | 78.42 |
| Crawford | 15135 | 79.28 |
| Douglas | 14400 | 73.04 |
| Hancock | 14260 | 78.74 |
| Edgar | 13795 | 78.65 |
| Union | 13280 | 77.55 |
| Bond | 13275 | 79.44 |
| Lawrence | 12850 | 79.37 |
| Warren | 12815 | 73.90 |
| Wayne | 12680 | 76.92 |
| Piatt | 12635 | 76.93 |
| De Witt | 12370 | 77.12 |
| Mercer | 12265 | 78.15 |
| Pike | 12185 | 77.34 |
| Clark | 12090 | 76.35 |
| Richland | 12080 | 76.07 |
| Carroll | 11615 | 79.77 |
| Massac | 11210 | 77.69 |
| Washington | 11060 | 78.14 |
| Mason | 10895 | 79.06 |
| Moultrie | 10875 | 73.95 |
| White | 10850 | 77.36 |
| Greene | 10395 | 78.63 |
| Clay | 10290 | 77.14 |
| Ford | 10270 | 76.64 |
| Johnson | 10140 | 80.48 |
| Menard | 9595 | 77.60 |
| Marshall | 9370 | 79.44 |
| Wabash | 8850 | 76.46 |
| Cass | 8690 | 68.61 |
| Cumberland | 8325 | 76.62 |
| Jasper | 7305 | 76.09 |
| Hamilton | 6365 | 77.43 |
| Schuyler | 5605 | 79.33 |
| Henderson | 5580 | 81.05 |
| Brown | 5515 | 82.62 |
| Edwards | 4985 | 76.63 |
| Alexander | 4925 | 75.42 |
| Putnam | 4540 | 79.03 |
| Pulaski | 4370 | 77.90 |
| Stark | 4250 | 77.27 |
| Gallatin | 4090 | 79.34 |
| Scott | 3890 | 77.11 |
| Calhoun | 3825 | 78.70 |
| Pope | 3625 | 85.29 |
| Hardin | 3300 | 82.29 |
