Knox County's 2026 population is estimated at 48,822, reflecting a 0.11% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Knox County is the 29th largest county in Illinois. The 2010 population was 52,911 and has grown -7.73% since 2010.
Data after 2023 is projected based on recent change
Overall: 42.6 years
Female: 44.3 years
Male: 40.9 years
There are 39,139 adults, (10,907 of whom are seniors) in Knox County.
Female: 24,053 (49%)
Male: 24,993 (51%)
The racial composition of Knox County includes 81.92% White, 8.08% Black or African American, and smaller percentages for other race, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
| Race | Population ↓ | Percentage (of total) |
|---|---|---|
| White | 40,178 | 81.92% |
| Black or African American | 3,962 | 8.08% |
| Two or more races | 3,400 | 6.93% |
| Other race | 853 | 1.74% |
| Asian | 617 | 1.26% |
| Native American | 29 | 0.06% |
| Native Hawaiian or Pacific Islander | 7 | 0.01% |
Knox County 's average per capita income is $43,784. Household income levels show a median of $57,030. The poverty rate stands at 14.57%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $94,596 | $111,857 |
| Families | $82,396 | $98,219 |
| Households | $57,030 | $74,560 |
| Non Families | $33,179 | $42,096 |
Average Income
Median Household Income
Poverty Rate
