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County in Illinois

St. Clair County

About 253,700 people, median household income $73,900.

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

Who lives in St. Clair County

Census survey estimates for 2020 to 2024, rounded.

People

Population
253,700
Median age
39.9 years
Under 18
23%
65 and over
17%
Veterans, of adults
12%
Speak another language at home
5%

Race and ethnicity

Hispanic or Latino, of any race
5%
White, not Hispanic
59%
Black, not Hispanic
28%
Asian, not Hispanic
2%

Income and housing

Median household income
$73,900
Below the poverty line
14%
Bachelor's or higher, adults 25+
32%
Owner-occupied homes
68%
Median home value
$180,000

2024 vote for president

Kamala Harris, Democrat
52.9%
Donald Trump, Republican
45.0%
Other candidates
2.1%

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

Represent all of St. Clair County

St. Clair County's districts (11)

U.S. House (2)

Illinois Senate (4)

Illinois House (5)

Towns (37)

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

13 more towns

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.