Rock Island County's estimated 2025 population is 140,590 with a growth rate of -0.23% 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 -4.76% since that time.
Data after 2023 is projected based on recent change
The racial composition of Rock Island County includes 73.04% White, 10.96% Black or African American, 4.54% other race, and smaller percentages for Asian, Native American, Native Hawaiian or Pacific Islander and multiracial populations.
Race | Population | Percentage (of total) |
|---|---|---|
| White | 104,439 | 73.04% |
| Black or African American | 15,668 | 10.96% |
| Two or more races | 11,960 | 8.36% |
| Other race | 6,493 | 4.54% |
| Asian | 3,746 | 2.62% |
| Native American | 462 | 0.32% |
| Native Hawaiian or Pacific Islander | 227 | 0.16% |
Married
Widowed
Divorced
Separated
Never Married
Rock Island County's average per capita income is $46,260. Household income levels show a median of $66,768. The poverty rate stands at 15.41%.
Name | Median | Mean |
|---|---|---|
| Married Families | $104,081 | $120,355 |
| Families | $87,207 | $101,817 |
| Households | $66,768 | $83,668 |
| Non Families | $39,693 | $52,815 |
Average Income
Median Household Income
Poverty Rate