Warren County's 2026 population is estimated at 16,203, reflecting a -0.04% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Warren County is the 65th largest county in Illinois. The 2010 population was 17,710 and has grown -8.51% since 2010.
Data after 2023 is projected based on recent change
Overall: 38.5 years
Female: 40.5 years
Male: 36.7 years
There are 12,754 adults, (3,286 of whom are seniors) in Warren County.
Female: 8,182 (49.7%)
Male: 8,265 (50.3%)
The racial composition of Warren County includes 82.84% White, 4.96% other race, and smaller percentages for Black or African American, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 13,624 | 82.84% |
| Two or more races | 947 | 5.76% |
| Other race | 816 | 4.96% |
| Black or African American | 438 | 2.66% |
| Asian | 395 | 2.4% |
| Native American | 157 | 0.95% |
| Native Hawaiian or Pacific Islander | 70 | 0.43% |
Warren County 's average per capita income is $43,745. Household income levels show a median of $67,385. The poverty rate stands at 14.63%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $98,500 | - |
| Families | $83,542 | $95,913 |
| Households | $67,385 | $86,803 |
| Non Families | $40,167 | $64,051 |
Average Income
Median Household Income
Poverty Rate
