In St. Clair, Illinois, the median home price is $180,981, compared with the Illinois median of $298,585; median household income is $73,854; the population is 253,694; schools rate 4.4 out of 10; the violent crime rate is 179.8 per 100k; and the average commute is 24.0 minutes. Sources: Zillow Research and the US Census Bureau.
Data updated June 2026 - Source: Zillow Research
St. Clair at a glance
Population
253,694
Median Household Income
$73,854
Typical Home Value
$180,981
School District Rating
4.4
Violent Crime Rate
179.8
Avg Commute Time
24.0
About St. Clair
St. Clair has a population of 253,694. The median home value is $180,981, 39% below the Illinois median. Median household income is $73,854 (11% below the Illinois median). The most populated towns are Belleville, St. Clair, and Caseyville.
Data comes from public sources including the U.S. Census Bureau, the National Center for Education Statistics, the FBI, the EPA, Zillow, and Redfin. Source attribution is shown on each metric.
Towns in St. Clair
22 towns, by population.
- Belleville41,370 pop.
- St. Clair35,601 pop.
- Caseyville35,032 pop.
- O'Fallon26,785 pop.
- Centreville19,674 pop.
- East St. Louis17,999 pop.
- Shiloh Valley12,849 pop.
- Mascoutah9,512 pop.
- Stookey9,018 pop.
- Canteen7,877 pop.
- Sugar Loaf6,779 pop.
- Millstadt6,616 pop.
- Freeburg5,006 pop.
- Lebanon4,369 pop.
- Smithton4,102 pop.
- New Athens2,633 pop.
- Prairie Du Long2,607 pop.
- Marissa1,835 pop.
- Fayetteville1,600 pop.
- Lenzburg943 pop.
- Engelmann758 pop.
- Stites729 pop.
County rankings in Illinois
Every county in Illinois, ranked on one decision metric at a time.
- Cheapest Counties to Buy a House
- Counties With the Lowest Monthly Housing Payment
- Counties With the Lowest Property Tax
- Counties With the Cheapest Homeowners Insurance
- Counties With the Cheapest Childcare
- Safest Counties From Natural Disasters
- Counties With the Lowest Flood Risk
- Counties With the Lowest Wildfire Risk
- Safest Counties (Lowest Violent Crime)
- Counties With the Best School Ratings
- Counties With the Highest Household Income
- Counties With the Shortest Commute
- Counties Where Homes Sell Fastest
St. Clair at a glance: frequently asked questions
- What is the population of St. Clair?
- St. Clair has a population of 253,694 based on the most recent US Census estimate.
- What is the median home price in St. Clair?
- The median home value in St. Clair is $180,981. Open the interactive map to see the distribution town by town.
- What is the median household income in St. Clair?
- Median household income in St. Clair is $73,854 per year, sourced from the US Census American Community Survey.
- What state is St. Clair in?
- St. Clair is in Illinois.
- How many towns are in St. Clair?
- St. Clair contains 22 towns and municipalities. Click any town below or on the map to see its housing, school, and crime data.
Compare St. Clair with other places
Put up to four states, counties, towns, or ZIPs side by side on income, housing, crime, education, and more.