Rents are 3% above what O Fallon's 10-year trend predicts — running hotter than its own history.
Rent by unit size
These are HUD Fair Market Rents, the payment standard for a Housing Choice Voucher (Section 8). They often differ from the $1,631 market median above, and that is expected: FMR is the 40th percentile of standard-quality units and counts gross rent, so it includes essential utilities such as electricity, water, gas, sewer, and trash. The market median is asking rent, which usually excludes utilities. HUD sets FMR once a year; market rent here updates monthly.
Source: HUD Small Area Fair Market Rents. Read the methodology →
12-month history
Last updated: October 17, 2026
What the numbers show
Rent in O Fallon is at its highest level since Zillow's records here began in January 2022.
Rent in O Fallon changed +6.7% over the year to September 2026. Across the 94 Illinois cities Zillow tracks, the typical change was +4.0%.
Rent has risen 5 months in a row, and rose in 10 of the last 12 months.
Fairview Heights, 5 miles away, rents for 21% less ($1,287/mo), about $4,100 a year in savings.
From Zillow's monthly rent index (ZORI) for O Fallon.
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Who lives here
O Fallon, IL is majority owner-occupied, has a large share of families with children, 52.4% of residents hold a bachelor's degree or higher.
Source: U.S. Census Bureau · ACS 2024 5-Year Estimates
How O Fallon, IL has changed in 5 years
Five years ago, renters in O Fallon, IL paid around $1,339 a month. That figure now sits near $1,631, up 21.8% from the 2022 baseline. The renter share has risen from 27.4% to 29.8%, with owner-occupied housing accounting for the remainder. Bachelor's-degree-or-higher attainment moved from 49.5% to 52.4% across the same window. Taken together, the five-year picture in O Fallon, IL reflects how housing costs and the people paying them have evolved through a stretch that included a pandemic, a hot rental market, and a recent cooling phase.
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At $1,631/mo, how O Fallon rent compares to typical pay (30% rule).
O Fallon rent by bedroom count
Median rent for each apartment size in O Fallon. Click any size for full breakdown.
Tips for renters in O Fallon
Last updated: October 17, 2026
The median rent in O Fallon is $1,631/mo as of October 2026. A studio apartment averages $1,130/mo while a 2-bedroom runs $1,440/mo. One-bedroom apartments average $1,170/mo and 3-bedroom units go for $1,860/mo.
At 27% of estimated US median household income ($72,000/yr), O Fallon ranks as affordable compared to the national benchmark of 30%. Rents have increased 6.7% over the past year.
Frequently asked questions
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How does O Fallon rent compare to other cities in Illinois?
Which nearby cities are cheaper to rent in than O Fallon?
At $1,631/mo, rent takes ~27% of US median household income ($72,000/yr). The standard benchmark is 30%.
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Estimated from ZIP-level data
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