St. Clair   County IL United States

County FIPS 17163
Largest City Belleville
State Illinois
Latitude 38.4703
Longitude -89.9284
Population 253,694
Density 385.8 people per square mile
Time Zone America/Chicago
  • All demographic data comes from the 2024 American Community Survey (5-year study).
  • Learn more about each field.
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Household Income

Median household: $73,854
Median individual: $40,542

Race

Mode: 60.1% White

Gender

 51.5% female 

Rent

  $1090 / month  

Median house value: $176,613.0

Age

Median: 39.9 years old

Education

With at least college degree: 31.8%
With STEM degree: 38.4%

Marital Status

 45.9% married 

Never married: 34.6%

Labor Force Participation

 63.4% working 

Unemployed: 6.0%

Average Family Size

 3.13 people 

Commute Time

 24.0 minutes 

Health Care

 5.1% uninsured 

Poverty

 13.6%

All data comes from the SimpleMaps US Counties Database, 2026.

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