Rents are 3% below what O Fallon's 10-year trend predicts — a better deal than its own history suggests.
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 $1,831 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
January. Asking rents in O Fallon usually run 1% below trend in January and 0.8% above it in May, about $33 a month apart at today's median. Based on 5 years of data.
Rent in O Fallon is 0.3% below its high of $1,836 in August 2026, at $1,831 as of September 2026.
Rent in O Fallon changed +2.7% over the year to September 2026. Across the 60 Missouri cities Zillow tracks, the typical change was +4.4%.
Rent rose in 10 of the last 12 months.
Saint Charles, 9 miles away, rents for 19% less ($1,485/mo), about $4,200 a year in savings.
From Zillow's monthly rent index (ZORI) for O Fallon. The seasonal pattern compares Zillow’s seasonally adjusted and unadjusted series.
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Who lives here
O Fallon, MO is majority owner-occupied, 43.3% of residents hold a bachelor's degree or higher.
Source: U.S. Census Bureau · ACS 2024 5-Year Estimates
How O Fallon, MO has changed in 5 years
Rent in O Fallon, MO has climbed 36.9% since 2021, going from about $1,337 per month to roughly $1,831 today. Headcount in the area went from 90,802 to 93,801 between 2021 and 2024, a 3.3% change. Reading these numbers side by side helps frame whether current listings in O Fallon, MO look reasonable against where the market sat half a decade ago.
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At $1,831/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 $1,831/mo as of October 2026. A studio apartment averages $1,135/mo while a 2-bedroom runs $1,455/mo. One-bedroom apartments average $1,180/mo and 3-bedroom units go for $1,880/mo.
At 31% of estimated US median household income ($72,000/yr), O Fallon ranks as moderate compared to the national benchmark of 30%. Rents have increased 2.8% over the past year.
Frequently asked questions
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At $1,831/mo, rent takes ~31% of US median household income ($72,000/yr). The standard benchmark is 30%.
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