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
Rank | County | Voting-age Population |
|---|---|---|
| 1 | Cook County | 4,172,402 |
| 2 | DuPage County | 724,333 |
| 3 | Lake County | 544,037 |
| 4 | Will County | 526,087 |
| 5 | Kane County | 388,814 |
| 6 | McHenry County | 238,877 |
| 7 | Winnebago County | 220,036 |
| 8 | Madison County | 209,140 |
| 9 | St. Clair County | 197,084 |
| 10 | Champaign County | 166,418 |
| 11 | Sangamon County | 153,188 |
| 12 | Peoria County | 139,675 |
| 13 | McLean County | 134,128 |
| 14 | Rock Island County | 112,700 |
| 15 | Tazewell County | 101,570 |
| 16 | Kendall County | 93,955 |
| 17 | LaSalle County | 86,518 |
| 18 | Kankakee County | 82,954 |
| 19 | Macon County | 80,964 |
| 20 | DeKalb County | 77,882 |
| 21 | Vermilion County | 57,211 |
| 22 | Williamson County | 52,532 |
| 23 | Adams County | 51,030 |
| 24 | Whiteside County | 43,617 |
| 25 | Jackson County | 42,742 |
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