Clinton County's 2026 population is estimated at 45,777, reflecting a -0.26% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Clinton County is the 12th largest county in Iowa. The 2010 population was 49,091 and has grown -6.75% since 2010.
Data after 2023 is projected based on recent change
Overall: 42.4 years
Female: 42.7 years
Male: 42 years
There are 35,686 adults, (9,378 of whom are seniors) in Clinton County.
Female: 23,443 (50.7%)
Male: 22,825 (49.3%)
The racial composition of Clinton County includes 89.46% White, 3.1% Black or African American, and smaller percentages for Asian, other race, Native American and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 41,393 | 89.46% |
| Two or more races | 2,726 | 5.89% |
| Black or African American | 1,434 | 3.1% |
| Asian | 310 | 0.67% |
| Other race | 279 | 0.6% |
| Native American | 126 | 0.27% |
Clinton County 's average per capita income is $48,894. Household income levels show a median of $66,981. The poverty rate stands at 13.19%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $106,362 | $124,982 |
| Families | $90,942 | $107,939 |
| Households | $66,981 | $88,373 |
| Non Families | $37,332 | $53,177 |
Average Income
Median Household Income
Poverty Rate
