What are current home values in O Fallon, IL?

The median home value in O Fallon, IL is $320,823 as of July 2026. This represents a 0.3% increase compared to last month and a 2.3% increase year-over-year.

How have home values changed in O Fallon, IL?

Home values in O Fallon, IL have increased by 0.3% month-over-month and 2.3% year-over-year.

How do home values in O Fallon, IL compare to Saint Clair County, Illinois, and the national average?

The median home value in O Fallon, IL ($320,823) compares to: Saint Clair County ($181,995), Illinois ($299,900), and the U.S. national median ($371,774).

O Fallon, IL Housing Market

$320,823

2.3% 1-yr

The average O Fallon, IL home value is $320,823, up 2.3% over the past year, and homes go to pending in around 8 days. (Updated on 7/31/2026)

What is the Zillow Home Values Index?

Zillow Home Value Index (ZHVI), built from the ground up by measuring monthly changes in property level Zestimates, captures both the level and home values across a wide variety of geographies and housing types.

Learn more about the Zillow Home Value Index

O Fallon Key Takeaways

Typical Home Values: $320,823

1-Year Value Change: +2.3%

(Data through July 31, 2026)

O Fallon Housing Market Overview

1-Year Market Forecast: --

For Sale Inventory: 109 (July 31, 2026)

New Listings: 57 (July 31, 2026)

Median Sale to List Ratio: 1.000 (June 30, 2026)

Median Sale Price: $349,000 (June 30, 2026)

Median List Price: $399,600 (July 31, 2026)

Percent of Sales Over List Price: 50.9% (June 30, 2026)

Percent of Sales Under List Price: 29.1% (June 30, 2026)

Median Days to Pending: 8 (July 31, 2026)

(Metric availability is based on market coverage and data, housing data available for download in the Housing Data page)

How does this data help me?
Zillow's metrics provide valuable market data by tracking market changes in different locations and housing types.

Neighborhoods in O Fallon

Move forward with a local partner

Zillow is more than a place to browse homes. It’s a place to connect with a local agent, explore financing solutions, schedule home tours, understand your buying and selling power, and more.

Talk to a local agent

O Fallon Homes for Sale

View O Fallon listings

Get pre-qualified for a loan

At Zillow Home Loans, we can pre-qualify you in as little as 5 minutes with no impact on your credit score.

Start Now

An equal housing lender. NMLS #10287.

O Fallon Rental Market Trends

Average Rent: $1,648 (July 31, 2026)

National Average Rent: $1,962 (July 31, 2026)

Month-Over-Month Change: 0.9% (July 31, 2026)

Year-Over-Year Change: 5.2% (July 31, 2026)

How does this data help me?
The Zillow Observed Rent Index (ZORI) measures changes in asking rents over time, controlling for changes in the quality of the available rental inventory.