In 2018, St. Clair County, IL had a population of 261k people with a median age of 39.6 and a median household income of $59,141. Between 2017 and 2018 the population of St. Clair County, IL declined from 262,479 to 261,059, a -0.541% decrease and its median household income grew from $51,670 to $59,141, a 14.5% increase.
N/A NaNk% of the people in St. Clair County, IL speak a non-English language, and 98.1% are U.S. citizens.
The largest universities in St. Clair County, IL are Southwestern Illinois College (2,672 degrees awarded in 2017), McKendree University (830 degrees), and Vatterott College-Fairview Heights (143 degrees).
The median property value in St. Clair County, IL is $132,200, and the homeownership rate is 65.8%. Most people in St. Clair County, IL commute by Drove Alone, and the average commute time is 24.5 minutes. The average car ownership in St. Clair County, IL is 2 cars per household.