St. Clair County, IL real estate

What the numbers say

St. Clair County, IL real estate at a glance

By AstroCore · Realtor.com, US Census and Freddie Mac data

In September 2026, the median home in St. Clair County listed for $219,950, down 9.9% from a year earlier. That is 32% below the Illinois median of $324,950.

Homes spent a median of 57 days on the market, slower than 52 days a year ago. That makes St. Clair County the #30 fastest-selling of 32 Illinois counties we track.

Homeowners in St. Clair County pay a median of $3,665 a year in property taxes on a median home value of $180,300, an effective rate of about 2.03%. The Illinois average is 2.01%, which makes St. Clair County the #76 lowest-tax of 102 counties in the state with published tax data.

Renters pay a median of $1,090 a month, and $1,070 for a two-bedroom. At today's prices a typical home costs about 17 times a year's rent.

With 20% down and today's 7.24% average 30-year rate, the monthly payment on a $220,000 home here comes to about $1,663 including property tax and insurance. Lenders typically want that to be under 28% of income, which works out to roughly $71,000 a year (the median household here earns $73,854).