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County in Illinois

Rock Island County

About 142,800 people, median household income $67,200.

District lines run through Rock Island County, so who represents you here depends on where you live. Search your address to see yours.

Who lives in Rock Island County

Census survey estimates for 2020 to 2024, rounded.

People

Population
142,800
Median age
40.3 years
Under 18
23%
65 and over
20%
Veterans, of adults
7%
Speak another language at home
14%

Race and ethnicity

Hispanic or Latino, of any race
14%
White, not Hispanic
67%
Black, not Hispanic
11%
Asian, not Hispanic
3%

Income and housing

Median household income
$67,200
Below the poverty line
16%
Bachelor's or higher, adults 25+
25%
Owner-occupied homes
70%
Median home value
$150,000

2024 vote for president

Kamala Harris, Democrat
53.8%
Donald Trump, Republican
44.2%
Other candidates
2.0%

Votes counted, by precinct. Source: MIT Election Data and Science Lab, precinct returns (public domain).

Represent all of Rock Island County

Rock Island County's districts (8)

U.S. House (1)

Illinois Senate (3)

Illinois House (4)

Towns (24)

Cities, villages and unincorporated communities, with the number of people in the county’s part of each at the 2020 Census.

Source: U.S. Census Bureau, American Community Survey 5-year estimates, 2020–2024; towns and counties from the 2020 Census, Demographic and Housing Characteristics. Figures rounded by us. Retrieved 2026-10-19. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.