Whiteside County's estimated 2026 population is 54,807 with a growth rate of 0.14% in the past year according to the most recent United States census data. Whiteside County is the 24th largest county in Illinois. The 2010 population was 58,489 and has seen a growth of -6.3% since that time.
Data after 2023 is projected based on recent change
The racial composition of Whiteside County includes 87.87% White, and smaller percentages for other race, Black or African American, Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
White (87.87%)
Two or more races (8.14%)
Other race (2.19%)
Black or African American (1.07%)
Asian (0.51%)
Native American (0.22%)
Native Hawaiian or Pacific Islander (0.01%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 48,497 | 87.87% |
| Two or more races | 4,490 | 8.14% |
| Other race | 1,206 | 2.19% |
| Black or African American | 592 | 1.07% |
| Asian | 280 | 0.51% |
| Native American | 122 | 0.22% |
| Native Hawaiian or Pacific Islander | 5 | 0.01% |
Married
Widowed
Divorced
Separated
Never Married
Whiteside County's average per capita income is $45,917. Household income levels show a median of $64,536. The poverty rate stands at 12.07%.
Name | Median | Mean |
|---|---|---|
| Married Families | $102,807 | $118,302 |
| Families | $85,370 | $102,388 |
| Households | $64,536 | $84,990 |
| Non Families | $36,286 | $50,805 |
Average Income
Median Household Income
Poverty Rate
