Homes for Sale in O Fallon, IL

87 homes for sale ยท Updated November 9, 2026

Market snapshot for O Fallon, IL

Median price
$430,000
Average price
$441,105
Highest price
$1,750,000
Avg price / sqft
$168/sqft
Avg home size
2,618 sqft
Avg days on market
46
Avg year built
1990
Avg beds / baths
3.8 bd / 3.1 ba

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