Lee County's 2026 population is estimated at 33,420, reflecting a -0.19% growth rate over the past year (World Population Review estimate based on U.S. Census Bureau data). Lee County is the 42nd largest county in Illinois. The 2010 population was 35,978 and has grown -7.11% since 2010.
Data after 2023 is projected based on recent change
Overall: 43.1 years
Female: 44.4 years
Male: 42.4 years
There are 27,214 adults, (7,227 of whom are seniors) in Lee County.
Female: 15,947 (47.1%)
Male: 17,922 (52.9%)
The racial composition of Lee County includes 85.8% White, 5.31% 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 | 29,059 | 85.8% |
| Two or more races | 2,306 | 6.81% |
| Black or African American | 1,798 | 5.31% |
| Other race | 414 | 1.22% |
| Asian | 243 | 0.72% |
| Native American | 37 | 0.11% |
| Native Hawaiian or Pacific Islander | 12 | 0.04% |
Lee County 's average per capita income is $47,743. Household income levels show a median of $70,292. The poverty rate stands at 11.82%.
| Name | Median ↓ | Mean |
|---|---|---|
| Married Families | $105,819 | $126,805 |
| Families | $88,313 | $108,540 |
| Households | $70,292 | $90,634 |
| Non Families | $38,923 | $53,902 |
Average Income
Median Household Income
Poverty Rate
