The median home value in O Fallon, IL is $319,631 as of 2026-06-30, up 2.18% from a year earlier.
Median Home Value
$319,631
Year-over-Year
+2.18%
Population
31,856
O Fallon ranks #139 of 279 Illinois cities tracked here by median home value, and sits 0.4% above the state's city median of $318,423. It sits in Saint Clair County, where the county-wide median is $180,981.
O Fallon police recorded a violent crime rate of 195 per 100,000 residents in 2024 — around the middle of the range for reporting cities. Property crime runs at 1,020 per 100,000.
Reported by the city's own police department to the FBI's Uniform Crime Reporting Program (what this covers).
The median home value in O Fallon is $319,631. That's up 2.18% from a year earlier. That is about 0.4% above the typical county in Illinois.
Homes in O Fallon are more expensive than Saint Clair County as a whole, where the median is $180,981 — a difference of about 76.6%.
O Fallon police reported 195 violent crimes per 100,000 residents, covering a population of about 31,856. Crime rates are one input among many — they vary block to block within a city, and this figure is a citywide average.