Illinois Citizen Voting-age Population By County in 2021 (ACS-5Yrs)
Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2021, the citizen voting-age population for Illinois was 9,133,895 and represented 71.24% of the total Illinois population.
Among all Illinois counties, Cook had the highest citizen voting-age population (3.62M), followed by DuPage (654.54K), and Will (489.93K).
In terms of percentages, Hardin had the highest percentage of its population being citizens of voting-age (85.95%), followed by Brown (81.75%), and Schuyler (81.74%).
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 | 3619805 | 68.75 |
| DuPage | 654535 | 70.07 |
| Will | 489930 | 70.35 |
| Lake | 483610 | 67.69 |
| Kane | 343090 | 66.15 |
| McHenry | 225435 | 72.55 |
| Winnebago | 205790 | 72.09 |
| Madison | 205615 | 77.27 |
| St. Clair | 194040 | 75.04 |
| Champaign | 151180 | 73.18 |
| Sangamon | 150240 | 76.36 |
| Peoria | 134050 | 73.48 |
| McLean | 128350 | 74.86 |
| Rock Island | 106220 | 73.41 |
| Tazewell | 100970 | 76.51 |
| Kendall | 88145 | 67.41 |
| LaSalle | 84425 | 76.76 |
| Kankakee | 80800 | 74.74 |
| Macon | 79705 | 76.40 |
| DeKalb | 74875 | 74.19 |
| Vermilion | 56525 | 75.41 |
| Williamson | 51845 | 77.07 |
| Adams | 50635 | 76.86 |
| Whiteside | 42650 | 76.26 |
| Jackson | 41785 | 77.85 |
| Ogle | 39075 | 75.46 |
| Knox | 39000 | 77.70 |
| Coles | 38470 | 80.92 |
| Grundy | 38210 | 72.97 |
| Henry | 37975 | 76.86 |
| Boone | 37630 | 70.22 |
| Macoupin | 35405 | 78.42 |
| Stephenson | 34805 | 77.66 |
| Franklin | 29435 | 77.32 |
| Woodford | 28960 | 75.08 |
| Clinton | 28765 | 77.64 |
| Marion | 28730 | 76.05 |
| Jefferson | 28725 | 76.89 |
| Livingston | 27715 | 77.20 |
| Fulton | 27135 | 79.76 |
| Lee | 27050 | 78.69 |
| Monroe | 26855 | 77.33 |
| Morgan | 26640 | 80.27 |
| Christian | 26630 | 78.23 |
| Effingham | 25895 | 74.90 |
| Bureau | 25650 | 76.94 |
| Randolph | 24220 | 79.07 |
| McDonough | 22640 | 81.60 |
| Logan | 22580 | 79.96 |
| Montgomery | 22550 | 79.18 |
| Iroquois | 20800 | 76.02 |
| Saline | 18620 | 78.01 |
| Jo Daviess | 17570 | 79.88 |
| Jersey | 16960 | 78.76 |
| Perry | 16920 | 79.96 |
| Fayette | 16835 | 78.25 |
| Shelby | 16495 | 77.95 |
| Crawford | 15000 | 79.68 |
| Douglas | 14510 | 73.62 |
| Hancock | 13905 | 78.34 |
| Edgar | 13590 | 79.94 |
| Bond | 13550 | 80.63 |
| Union | 13450 | 77.93 |
| Piatt | 12880 | 77.29 |
| Warren | 12775 | 75.66 |
| Carroll | 12380 | 79.44 |
| Wayne | 12360 | 76.06 |
| Mercer | 12335 | 78.17 |
| Lawrence | 12320 | 79.66 |
| De Witt | 12145 | 77.58 |
| Richland | 12025 | 75.75 |
| Clark | 11915 | 76.45 |
| Pike | 11450 | 76.72 |
| Massac | 11005 | 77.07 |
| Washington | 10860 | 78.55 |
| Moultrie | 10825 | 73.97 |
| White | 10800 | 77.36 |
| Johnson | 10595 | 80.02 |
| Mason | 10450 | 79.02 |
| Ford | 10325 | 75.97 |
| Clay | 10240 | 76.91 |
| Greene | 9525 | 78.17 |
| Menard | 9460 | 76.63 |
| Marshall | 9270 | 78.69 |
| Cass | 8840 | 67.69 |
| Wabash | 8735 | 76.52 |
| Cumberland | 8060 | 76.54 |
| Jasper | 7080 | 75.93 |
| Hamilton | 6255 | 77.99 |
| Schuyler | 5685 | 81.74 |
| Henderson | 5280 | 81.42 |
| Brown | 5175 | 81.75 |
| Edwards | 4805 | 77.07 |
| Putnam | 4475 | 79.34 |
| Alexander | 4240 | 77.23 |
| Stark | 4215 | 77.55 |
| Pulaski | 4150 | 78.60 |
| Gallatin | 4020 | 79.76 |
| Scott | 3820 | 77.56 |
| Calhoun | 3615 | 79.71 |
| Hardin | 3180 | 85.95 |
| Pope | 3105 | 81.28 |
