Knox County's estimated 2026 population is 48,822 with a growth rate of 0.11% in the past year according to the most recent United States census data. Knox County is the 29th largest county in Illinois. The 2010 population was 52,911 and has seen a growth of -7.73% since that time.
Data after 2023 is projected based on recent change
The racial composition of Knox County includes 83.27% White, 7.78% Black or African American, and smaller percentages for other race, Asian, Native American and multiracial populations.
White (83.27%)
Black or African American (7.78%)
Two or more races (5.82%)
Other race (2.04%)
Asian (1.02%)
Native American (0.07%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 41,048 | 83.27% |
| Black or African American | 3,834 | 7.78% |
| Two or more races | 2,871 | 5.82% |
| Other race | 1,004 | 2.04% |
| Asian | 501 | 1.02% |
| Native American | 36 | 0.07% |
Married
Widowed
Divorced
Separated
Never Married
Knox County's average per capita income is $40,727. Household income levels show a median of $53,291. The poverty rate stands at 15.86%.
Name | Median | Mean |
|---|---|---|
| Married Families | $91,507 | $104,998 |
| Families | $79,128 | $91,482 |
| Households | $53,291 | $69,635 |
| Non Families | $31,022 | $39,543 |
Average Income
Median Household Income
Poverty Rate
