Williamson County's estimated 2025 population is 67,030 with a growth rate of 0.24% in the past year according to the most recent United States census data. Williamson County is the 22nd largest county in Illinois. The 2010 population was 66,440 and has seen a growth of 0.89% since that time.
Data after 2023 is projected based on recent change
The racial composition of Williamson County includes 89.24% White, 3.49% Black or African American, and smaller percentages for Asian, Native American, other race, Native Hawaiian or Pacific Islander and multiracial populations.
White
Two or more races
Black or African American
Asian
Native American
Other race
Native Hawaiian or Pacific Islander
Race | Population | Percentage (of total) |
|---|---|---|
| White | 59,702 | 89.24% |
| Two or more races | 3,288 | 4.91% |
| Black or African American | 2,333 | 3.49% |
| Asian | 1,043 | 1.56% |
| Native American | 310 | 0.46% |
| Other race | 226 | 0.34% |
| Native Hawaiian or Pacific Islander | 0 | 0% |
Married
Widowed
Divorced
Separated
Never Married
Williamson County's average per capita income is $45,965. Household income levels show a median of $65,521. The poverty rate stands at 14.28%.
Name | Median | Mean |
|---|---|---|
| Married Families | $102,560 | $119,532 |
| Families | $85,336 | $103,135 |
| Households | $65,521 | $85,557 |
| Non Families | $36,994 | $52,193 |
Average Income
Median Household Income
Poverty Rate
