Knox County's estimated 2026 population is 47,570 with a growth rate of -0.41% in the past year according to the most recent United States census data. Knox County is the 30th largest county in Illinois. The 2010 population was 52,911 and has seen a growth of -10.09% since that time.
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
