How many bedrooms do homes in O'Fallon, IL have?

Name: Bedrooms in O'Fallon, IL, 2020–2024
Creator: US Census Bureau
License: https://www.census.gov/data/developers/about/terms-of-service.html

In O'Fallon, IL, 10.3% of homes are studios or one-bedrooms and 66.9% have three or more bedrooms (2020–2024 American Community Survey).

The most common size is 4 bedrooms, 30.9% of homes.

Figures last updated on November 12, 2026.

Studio or 1 bedroom: 10.3%
3 or more bedrooms: 66.9% (±4.6 points)
Most common: 4 bedrooms

Homes in O'Fallon by bedroom count

Housing units by bedrooms, 2020–2024
Bedrooms	O'Fallon	St. Clair County	Illinois	United States
No bedroom (studio)	2.9% (±2.2 points)	1.9%	3.1%	2.9%
1 bedroom	7.4% (±2.1 points)	8.7%	11.5%	10.9%
2 bedrooms	22.8% (±3.8 points)	27.3%	27.7%	25.0%
3 bedrooms	26.8% (±3.5 points)	39.0%	35.8%	38.7%
4 bedrooms	30.9% (±2.6 points)	18.1%	16.9%	17.5%
5 or more bedrooms	9.2% (±1.4 points)	5.0%	4.8%	4.9%

In O'Fallon, the share of homes with three or more bedrooms is not measurably different from St. Clair County (62.1%).

It is also higher than in Illinois (57.5%).

It is higher than the national figure (61.1%).

Homes with 3 or more bedrooms in places near O'Fallon

Nearest places with a published estimate, compared with O'Fallon
Place	Distance	Homes with 3 or more bedrooms	Compared with this place
O'Fallon	—	66.9% (±4.6 points)	—
O'Fallon Township	2.9 mi	69.0% (±4.4 points)	Not measurably different
Shiloh	3.5 mi	66.7% (±7.3 points)	Not measurably different
Caseyville Township	3.6 mi	61.4% (±4.1 points)	Not measurably different
Fairview Heights	4.8 mi	60.7% (±6.3 points)	Not measurably different
Swansea	5.1 mi	65.9% (±7.2 points)	Not measurably different
Scott AFB	5.2 mi	83.9% (±17.0 points)	Not measurably different
Shiloh Valley Township	5.4 mi	80.6% (±9.8 points)	Higher
Lebanon	5.7 mi	45.7% (±11.2 points)	Lower

Nearby places with a measurably lower figure: Lebanon, IL (45.7%).

Nearby places with a measurably higher figure: Shiloh Valley Township, IL (80.6%).

Distance is measured in a straight line between the Census Bureau’s internal points for each place.

Homes with 3 or more bedrooms across St. Clair County, place by place

Rank	Place	Homes with 3 or more bedrooms
12	Freeburg Township	74.0% (±9.5 points)
13	Mascoutah Township	73.6% (±7.4 points)
14	Mascoutah	72.3% (±7.6 points)
15	Engelmann Township	71.0% (±29.0 points)
16	East Carondelet	69.3% (±18.3 points)
17	O'Fallon Township	69.0% (±4.4 points)
18	O'Fallon	66.9% (±4.6 points)
19	Shiloh	66.7% (±7.3 points)
20	Swansea	65.9% (±7.2 points)
21	Lenzburg Township	65.8% (±16.8 points)
22	St. Clair Township	65.2% (±4.9 points)
23	Marissa	63.6% (±11.6 points)
24	Marissa Township	63.5% (±13.3 points)

Showing 13 of 46 places in St. Clair County, ranked from highest to lowest.

Survey years: 2020–2024 (American Community Survey 5-year estimates).

Margins of error are at the 90% confidence level.

What you can do on Seayora in O'Fallon

One account for renting, owning, managing and fixing homes, with these figures beside you.

Own or manage a rental?

List it, sign the lease and collect rent online, with the figures for O'Fallon beside you.

Create a landlord account · See what landlords get

Looking for a place to rent?

Browse homes for rent near O'Fallon, save the ones you like and apply online.

Browse rentals · Create a renter account

Do repairs, renovations or maintenance?

Get found by owners and renters near O'Fallon, and send estimates and invoices from your phone.

Join as a pro · Find a pro

Questions about O'Fallon

What is the most common home size in O'Fallon?

The most common size is 4 bedrooms, 30.9% of homes in O'Fallon, IL.

How many studios and one-bedroom homes are in O'Fallon?

10.3% of homes in O'Fallon have one bedroom or none.

Sources

Selected Housing Characteristics (DP04), 2020–2024 ACS 5-year estimates — O'Fallon city, Illinois

To check these figures in the Census Bureau’s own API, request the variables below from the 2024 ACS 5-year data profile (acs/acs5/profile) for O'Fallon city, Illinois (place:55249, in state:17).

Each estimate (E or PE) has a margin of error beside it (M or PM).

The API needs a free key.

Request a Census API key.

DP04_0039PE, DP04_0039PM, DP04_0040PE, DP04_0040PM, DP04_0041PE, DP04_0041PM, DP04_0042PE, DP04_0042PM, DP04_0043PE, DP04_0043PM, DP04_0044PE, DP04_0044PM

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Figures are published by the US Census Bureau, HUD, the Bureau of Labor Statistics and the FBI; Seayora reproduces them and does not adjust them, except where a sentence says it compares dollar figures after inflation. They describe the whole place, not any one building or street, and are not an appraisal, a rent determination, a tax bill, a safety rating or legal advice.