Clark County's 2026 population is estimated at 14,792, reflecting a -0.95% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Clark County is the 71st largest county in Illinois. The 2010 population was 16,291 and has grown -9.2% since 2010.
Data after 2023 is projected based on recent change
Overall: 42.6 years
Female: 43.8 years
Male: 40.8 years
There are 11,854 adults, (3,095 of whom are seniors) in Clark County.
Female: 7,581 (49.7%)
Male: 7,685 (50.3%)
The racial composition of Clark County includes 95.24% White, and smaller percentages for Black or African American, Native American, other race, Asian and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 14,540 | 95.24% |
| Two or more races | 539 | 3.53% |
| Black or African American | 70 | 0.46% |
| Native American | 57 | 0.37% |
| Other race | 41 | 0.27% |
| Asian | 19 | 0.12% |
Clark County 's average per capita income is $48,590. Household income levels show a median of $72,927. The poverty rate stands at 9.15%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $102,896 | - |
| Families | $88,378 | $104,665 |
| Households | $72,927 | $87,731 |
| Non Families | $42,646 | $49,682 |
Average Income
Median Household Income
Poverty Rate
