Rock Island County's estimated 2026 population is 142,147 with a growth rate of 0.2% in the past year according to the most recent United States census data. Rock Island County is the 15th largest county in Illinois. The 2010 population was 147,613 and has seen a growth of -3.7% since that time.
Data after 2023 is projected based on recent change
Overall: 40.3 years
Female: 41.3 years
Male: 39 years
There are 110,666 adults, (29,061 of whom are seniors) in Rock Island County.
Female: 72,135 (50.5%)
Male: 70,622 (49.5%)
The racial composition of Rock Island County includes 71.5% White, 11.4% Black or African American, 4.37% other race, and smaller percentages for Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 102,074 | 71.5% |
| Black or African American | 16,270 | 11.4% |
| Two or more races | 13,440 | 9.41% |
| Other race | 6,244 | 4.37% |
| Asian | 3,943 | 2.76% |
| Native American | 555 | 0.39% |
| Native Hawaiian or Pacific Islander | 231 | 0.16% |
Rock Island County's average per capita income is $47,164. Household income levels show a median of $67,159. The poverty rate stands at 15.5%.
Name | Median | Mean |
|---|---|---|
| Married Families | $105,313 | $122,819 |
| Families | $87,978 | $103,596 |
| Households | $67,159 | $85,299 |
| Non Families | $40,667 | $54,673 |
Average Income
Median Household Income
Poverty Rate