Clinton County's 2026 population is estimated at 42,556, reflecting a 0.6% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Clinton County is the 58th largest county in Ohio. The 2010 population was 41,922 and has grown 1.51% since 2010.
Overall: 40.8 years
Female: 41.6 years
Male: 39.7 years
There are 32,482 adults, (7,803 of whom are seniors) in Clinton County.
Female: 21,171 (50.4%)
Male: 20,841 (49.6%)
The racial composition of Clinton County includes 92.12% White, and smaller percentages for Black or African American, other race, Native American, Asian, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 38,700 | 92.12% |
| Two or more races | 1,702 | 4.05% |
| Black or African American | 784 | 1.87% |
| Other race | 401 | 0.95% |
| Native American | 301 | 0.72% |
| Asian | 108 | 0.26% |
| Native Hawaiian or Pacific Islander | 16 | 0.04% |
Clinton County 's average per capita income is $45,972. Household income levels show a median of $70,407. The poverty rate stands at 12.88%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $100,266 | $121,527 |
| Families | $88,121 | $107,994 |
| Households | $70,407 | $89,775 |
| Non Families | $39,481 | $48,139 |
Average Income
Median Household Income
Poverty Rate