Illinois Citizen Voting-age Population By County in 2017 (ACS-5Yrs)
Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2017, the citizen voting-age population for Illinois was 9,043,520 and represented 70.35% of the total Illinois population.
Among all Illinois counties, Cook had the highest citizen voting-age population (3.54M), followed by DuPage (646.72K), and Will (472.79K).
In terms of percentages, Pope had the highest percentage of its population being citizens of voting-age (83.72%), followed by Brown (82.99%), and Hardin (82.57%).
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 | 3538445 | 67.55 |
| DuPage | 646715 | 69.40 |
| Will | 472785 | 68.75 |
| Lake | 466915 | 66.28 |
| Kane | 334190 | 63.13 |
| McHenry | 219900 | 71.39 |
| Winnebago | 208295 | 72.45 |
| Madison | 204600 | 76.87 |
| St. Clair | 198050 | 74.90 |
| Champaign | 152565 | 73.37 |
| Sangamon | 150065 | 75.74 |
| Peoria | 136050 | 73.09 |
| McLean | 128080 | 73.94 |
| Rock Island | 107085 | 73.24 |
| Tazewell | 102625 | 76.19 |
| LaSalle | 84955 | 76.43 |
| Macon | 82395 | 76.59 |
| Kendall | 82180 | 66.85 |
| Kankakee | 81060 | 73.16 |
| DeKalb | 77265 | 73.96 |
| Vermilion | 59215 | 74.76 |
| Williamson | 52190 | 77.35 |
| Adams | 51305 | 76.82 |
| Jackson | 46320 | 78.36 |
| Whiteside | 43200 | 76.02 |
| Coles | 42300 | 80.51 |
| Knox | 40400 | 78.64 |
| Ogle | 38465 | 74.52 |
| Henry | 37890 | 76.31 |
| Grundy | 36895 | 73.30 |
| Boone | 36775 | 68.56 |
| Macoupin | 35990 | 78.31 |
| Stephenson | 35465 | 77.37 |
| Franklin | 30425 | 77.42 |
| Jefferson | 29685 | 77.39 |
| Marion | 29330 | 76.57 |
| Clinton | 29305 | 77.86 |
| Woodford | 29135 | 74.82 |
| Livingston | 28365 | 77.06 |
| Fulton | 28105 | 78.65 |
| Morgan | 27375 | 79.49 |
| Lee | 27210 | 78.48 |
| Christian | 26385 | 78.62 |
| Randolph | 26300 | 80.11 |
| Monroe | 25840 | 76.59 |
| Effingham | 25755 | 75.38 |
| McDonough | 25590 | 80.99 |
| Bureau | 25555 | 76.01 |
| Logan | 23660 | 80.23 |
| Montgomery | 23245 | 79.67 |
| Iroquois | 21725 | 76.35 |
| Saline | 18980 | 77.69 |
| Jo Daviess | 17500 | 79.38 |
| Fayette | 17375 | 79.05 |
| Jersey | 17310 | 77.92 |
| Perry | 17215 | 80.20 |
| Shelby | 17140 | 78.25 |
| Crawford | 15335 | 79.81 |
| Douglas | 14420 | 72.72 |
| Hancock | 14320 | 78.40 |
| Edgar | 13800 | 78.39 |
| Bond | 13475 | 79.10 |
| Union | 13300 | 77.03 |
| Lawrence | 13095 | 79.58 |
| Warren | 12860 | 73.78 |
| Wayne | 12755 | 76.98 |
| Piatt | 12610 | 76.73 |
| De Witt | 12510 | 77.34 |
| Pike | 12350 | 77.53 |
| Mercer | 12310 | 77.94 |
| Richland | 12280 | 76.97 |
| Clark | 12160 | 76.36 |
| Carroll | 11735 | 79.80 |
| Massac | 11340 | 77.70 |
| Washington | 11130 | 78.05 |
| Mason | 10975 | 78.93 |
| White | 10950 | 77.19 |
| Moultrie | 10935 | 74.34 |
| Johnson | 10465 | 81.12 |
| Greene | 10415 | 78.25 |
| Clay | 10400 | 77.64 |
| Ford | 10285 | 76.36 |
| Menard | 9610 | 77.41 |
| Marshall | 9435 | 79.12 |
| Wabash | 8845 | 76.45 |
| Cass | 8800 | 68.32 |
| Cumberland | 8385 | 76.93 |
| Jasper | 7270 | 75.65 |
| Hamilton | 6400 | 77.48 |
| Schuyler | 5825 | 81.13 |
| Brown | 5635 | 82.99 |
| Henderson | 5585 | 80.65 |
| Alexander | 5100 | 75.28 |
| Edwards | 5020 | 76.41 |
| Putnam | 4530 | 78.51 |
| Pulaski | 4425 | 77.77 |
| Stark | 4295 | 77.39 |
| Gallatin | 4100 | 78.47 |
| Scott | 3950 | 77.30 |
| Calhoun | 3855 | 78.75 |
| Pope | 3650 | 83.72 |
| Hardin | 3435 | 82.57 |
