Market Overview
Home Prices in O Fallon, IL
The median home value in O Fallon, IL is $319,631 as of mid-2026, according to Zillow's Home Value Index (ZHVI).That's up 2.2% compared to a year ago and up 3.6% from two years prior.
Compared to the U.S. national median of $410,000, homes in O Fallon are priced22% below average. O Fallon is part of the St. Louis, MO-IL metro area.
Over the past five years, O Fallon home values have risen by approximately26.5%, reflecting strong long-term appreciation in this market.
Price History
O Fallon Home Price Trend
City Comparison
O Fallon vs. National Median
At $319,631, homes in O Fallon cost 22% below the national median of $410,000. This makes O Fallon a relatively affordable market for buyers seeking value.
Affordability
What Does It Cost to Buy in O Fallon?
20% Down Payment
$63,926
on $319,631
Monthly P&I
$1,667/mo
30-yr @ 6.8%
Total Monthly Est.
~$2,117/mo
incl. taxes & insurance
Income Needed
$84,680
gross annual (30% rule)
10% Down Option
$31,963
+ PMI applies
Loan Amount (20% dn)
$255,705
at current rates
Estimates assume a 30-year fixed mortgage at 6.8%. Monthly total includes estimated property taxes and homeowner's insurance. Actual costs vary.
FAQ
Frequently Asked Questions
What is the average home price in O Fallon, IL?
The median home value in O Fallon is $319,631 as of mid-2026, according to Zillow's Home Value Index (ZHVI). That's up 2.2% year-over-year.
How much have home prices changed in O Fallon?
Over the past year, home values in O Fallon have increased by 2.2%. Over five years, prices have risen approximately 26.5%.
How much do I need to earn to buy a home in O Fallon?
To comfortably afford the median home price of $319,631 with a 20% down payment ($63,926) at today's rates (6.8%), you'd need a gross annual income of approximately $84,680. This assumes keeping total housing costs at or below 30% of gross income.
How does O Fallon compare to the national average home price?
The national median home value is approximately $410,000. At $319,631, homes in O Fallon are 22% below the national average.
What metro area is O Fallon part of?
O Fallon is part of the St. Louis, MO-IL metropolitan area. Home prices and market conditions can vary across the broader metro region.