Ranking of Illinois Counties By Total Voting-age Population (18yrs and over) from Census 2020
Updated on August 22, 2023.
According to the data from the US 2020 Census, as at April 2020, among all the counties in Illinois, Cook County had the highest voting-age population (18 years and over) (4.17M), followed by DuPage County (724.33K), and Lake County (544.04K).
The chart below shows the top 10 counties with high voting-age population, and the table below shows the ranking of all Illinois counties based on voting-age population.
You can also see the ranking of counties by population for other states as well as for the whole United States.
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Related Topics: Illinois Census 2020 Topic List.
Data Source: US Census Bureau, 2020 Census.
Ranking of Illinois Counties By Total Voting-age Population from Census 2020
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| Rank | County | Voting-age Population |
|---|---|---|
| 1 | Cook County | 4172402 |
| 2 | DuPage County | 724333 |
| 3 | Lake County | 544037 |
| 4 | Will County | 526087 |
| 5 | Kane County | 388814 |
| 6 | McHenry County | 238877 |
| 7 | Winnebago County | 220036 |
| 8 | Madison County | 209140 |
| 9 | St. Clair County | 197084 |
| 10 | Champaign County | 166418 |
| 11 | Sangamon County | 153188 |
| 12 | Peoria County | 139675 |
| 13 | McLean County | 134128 |
| 14 | Rock Island County | 112700 |
| 15 | Tazewell County | 101570 |
| 16 | Kendall County | 93955 |
| 17 | LaSalle County | 86518 |
| 18 | Kankakee County | 82954 |
| 19 | Macon County | 80964 |
| 20 | DeKalb County | 77882 |
| 21 | Vermilion County | 57211 |
| 22 | Williamson County | 52532 |
| 23 | Adams County | 51030 |
| 24 | Whiteside County | 43617 |
| 25 | Jackson County | 42742 |
| 26 | Boone County | 40102 |
| 27 | Knox County | 40028 |
| 28 | Ogle County | 39983 |
| 29 | Grundy County | 39383 |
| 30 | Henry County | 38047 |
| 31 | Coles County | 37724 |
| 32 | Macoupin County | 35590 |
| 33 | Stephenson County | 35131 |
| 34 | Franklin County | 29695 |
| 35 | Marion County | 29147 |
| 36 | Woodford County | 28999 |
| 37 | Clinton County | 28856 |
| 38 | Jefferson County | 28846 |
| 39 | Livingston County | 27963 |
| 40 | Lee County | 27405 |
| 41 | Christian County | 27218 |
| 42 | Monroe County | 26998 |
| 43 | Fulton County | 26974 |
| 44 | Effingham County | 26584 |
| 45 | Morgan County | 26419 |
| 46 | Bureau County | 26212 |
| 47 | Randolph County | 24201 |
| 48 | Logan County | 22539 |
| 49 | Montgomery County | 22522 |
| 50 | McDonough County | 22289 |
| 51 | Iroquois County | 21113 |
| 52 | Saline County | 18471 |
| 53 | Jo Daviess County | 17812 |
| 54 | Jersey County | 17098 |
| 55 | Fayette County | 17041 |
| 56 | Perry County | 16873 |
| 57 | Shelby County | 16515 |
| 58 | Crawford County | 14891 |
| 59 | Douglas County | 14852 |
| 60 | Hancock County | 13868 |
| 61 | Union County | 13732 |
| 62 | Bond County | 13675 |
| 63 | Edgar County | 13394 |
| 64 | Warren County | 13253 |
| 65 | Piatt County | 12961 |
| 66 | Carroll County | 12871 |
| 67 | Wayne County | 12412 |
| 68 | Lawrence County | 12334 |
| 69 | Mercer County | 12289 |
| 70 | Richland County | 12246 |
| 71 | De Witt County | 12184 |
| 72 | Clark County | 11993 |
| 73 | Pike County | 11391 |
| 74 | Johnson County | 10998 |
| 75 | White County | 10993 |
| 76 | Massac County | 10953 |
| 77 | Moultrie County | 10942 |
| 78 | Washington County | 10831 |
| 79 | Ford County | 10501 |
| 80 | Mason County | 10430 |
| 81 | Clay County | 10245 |
| 82 | Cass County | 9826 |
| 83 | Menard County | 9507 |
| 84 | Greene County | 9311 |
| 85 | Marshall County | 9305 |
| 86 | Wabash County | 8864 |
| 87 | Cumberland County | 8062 |
| 88 | Jasper County | 7209 |
| 89 | Hamilton County | 6177 |
| 90 | Schuyler County | 5621 |
| 91 | Henderson County | 5185 |
| 92 | Brown County | 5156 |
| 93 | Edwards County | 4814 |
| 94 | Putnam County | 4555 |
| 95 | Alexander County | 4238 |
| 96 | Stark County | 4217 |
| 97 | Pulaski County | 4127 |
| 98 | Gallatin County | 3930 |
| 99 | Scott County | 3866 |
| 100 | Calhoun County | 3535 |
| 101 | Pope County | 3068 |
| 102 | Hardin County | 2985 |