Winnebago County's estimated 2026 population is 284,383 with a growth rate of 0.25% in the past year according to the most recent United States census data. Winnebago County is the 7th largest county in Illinois. The 2010 population was 295,090 and has seen a growth of -3.63% since that time.
Data after 2023 is projected based on recent change
Overall: 39.6 years
Female: 40.3 years
Male: 38.7 years
There are 216,761 adults, (52,518 of whom are seniors) in Winnebago County.
Female: 144,704 (51.1%)
Male: 138,588 (48.9%)
The racial composition of Winnebago County includes 66.39% White, 12.04% Black or African American, 6.1% other race, and smaller percentages for Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 188,087 | 66.39% |
| Black or African American | 34,098 | 12.04% |
| Two or more races | 33,580 | 11.85% |
| Other race | 17,280 | 6.1% |
| Asian | 8,280 | 2.92% |
| Native American | 1,849 | 0.65% |
| Native Hawaiian or Pacific Islander | 118 | 0.04% |
Winnebago County's average per capita income is $46,733. Household income levels show a median of $65,837. The poverty rate stands at 15.62%.
Name | Median | Mean |
|---|---|---|
| Married Families | $102,225 | $122,208 |
| Families | $83,365 | $102,686 |
| Households | $65,837 | $86,473 |
| Non Families | $40,000 | $55,741 |
Average Income
Median Household Income
Poverty Rate
