Clinton County's estimated 2026 population is 37,168 with a growth rate of 0.11% in the past year according to the most recent United States census data. Clinton County is the 35th largest county in Illinois. The 2010 population was 37,833 and has seen a growth of -1.76% since that time.
Data after 2023 is projected based on recent change
Overall: 41.5 years
Female: 42.8 years
Male: 40.3 years
There are 28,974 adults, (6,955 of whom are seniors) in Clinton County.
Female: 17,811 (48.2%)
Male: 19,143 (51.8%)
The racial composition of Clinton County includes 90.88% White, 3.15% Black or African American, and smaller percentages for other race, Asian, Native American and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 33,584 | 90.88% |
| Two or more races | 1,595 | 4.32% |
| Black or African American | 1,164 | 3.15% |
| Other race | 303 | 0.82% |
| Asian | 231 | 0.63% |
| Native American | 77 | 0.21% |
Clinton County's average per capita income is $56,058. Household income levels show a median of $86,588. The poverty rate stands at 7.37%.
Name | Median | Mean |
|---|---|---|
| Married Families | $117,424 | - |
| Families | $107,315 | $127,694 |
| Households | $86,588 | $108,402 |
| Non Families | $44,186 | $65,552 |
Average Income
Median Household Income
Poverty Rate
