What kinds of homes are in O'Fallon, MO?

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

O'Fallon, MO has 36,206 (±694) homes (2020–2024 American Community Survey).

That is about 1,185 homes per square mile of land.

75.2% are detached single-family houses.

2.2% are in buildings of two to four units.

10.2% are in buildings of five or more units.

Figures last updated on November 12, 2026.

Housing units: 36,206 (±694)
Detached houses: 75.2%
2–4 unit buildings: 2.2%
5+ unit buildings: 10.2%

Homes in O'Fallon by building size

Housing units by units in structure, 2020–2024
Building type	O'Fallon	St. Charles County	Missouri	United States
Single-family, detached	75.2% (±1.6 points)	74.7%	70.5%	61.3%
Single-family, attached (townhouse, rowhouse)	9.1% (±1.1 points)	7.5%	3.7%	6.2%
2 units	0.4% (±0.2 points)	0.9%	3.2%	3.4%
3 or 4 units	1.8% (±0.5 points)	3.1%	4.6%	4.3%
5 to 9 units	2.5% (±0.6 points)	3.1%	3.6%	4.5%
10 to 19 units	3.0% (±0.6 points)	3.7%	3.4%	4.3%
20 or more units	4.7% (±0.9 points)	4.4%	5.8%	10.3%
Mobile home	3.4% (±0.8 points)	2.5%	5.2%	5.6%
Boat, RV, van, etc.	0.0% (±0.1 points)	0.0%	0.1%	0.1%

In O'Fallon, the share of homes in buildings of five or more units is not measurably different from St. Charles County (11.2%).

It is also lower than in Missouri (12.8%).

It is lower than the national figure (19.1%).

Homes in buildings of 5 or more units in places near O'Fallon

Nearest places with a published estimate, compared with O'Fallon
Place	Distance	Homes in buildings of 5 or more units	Compared with this place
O'Fallon	—	10.2% (±1.2 points)	—
Dardenne Prairie	3.0 mi	1.4% (±1.2 points)	Lower
Lake St. Louis	3.5 mi	18.7% (±4.1 points)	Higher
Cottleville	4.1 mi	19.5% (±7.2 points)	Higher
St. Paul	4.6 mi	3.1% (±5.8 points)	Lower
Josephville	4.8 mi	19.0% (±30.6 points)	Not measurably different
Weldon Spring Heights	5.9 mi	0.0% (±83.3 points)	Not measurably different
St. Peters	6.2 mi	12.2% (±1.9 points)	Not measurably different
Weldon Spring	6.4 mi	16.9% (±6.1 points)	Higher

Nearby places with a measurably lower figure: Dardenne Prairie, MO (1.4%), St. Paul, MO (3.1%).

Nearby places with a measurably higher figure: Lake St. Louis, MO (18.7%), Cottleville, MO (19.5%), Weldon Spring, MO (16.9%).

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

Homes in buildings of 5 or more units across St. Charles County, place by place

Rank	Place	Homes in buildings of 5 or more units
2	St. Charles	20.0% (±2.0 points)
3	Cottleville	19.5% (±7.2 points)
4	Josephville	19.0% (±30.6 points)
5	Lake St. Louis	18.7% (±4.1 points)
6	Weldon Spring	16.9% (±6.1 points)
7	St. Peters	12.2% (±1.9 points)
8	O'Fallon	10.2% (±1.2 points)
9	Wentzville	8.0% (±1.8 points)
10	Foristell	4.4% (±14.3 points)
11	St. Paul	3.1% (±5.8 points)
12	Dardenne Prairie	1.4% (±1.2 points)
13 (tie)	Augusta	0.0% (±32.7 points)
13 (tie)	New Melle	0.0% (±29.3 points)

Showing 13 of 17 places in St. Charles 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.

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Questions about O'Fallon

How many homes are in O'Fallon?

O'Fallon, MO has an estimated 36,206 (±694) housing units, occupied and vacant (2020–2024 American Community Survey).

Are most homes in O'Fallon houses or apartments?

75.2% are detached houses and 9.1% attached houses, while 12.4% are in buildings of two or more units.

How many two-family and small multifamily homes are in O'Fallon?

2.2% of homes in O'Fallon are in buildings of two to four units, the small rental buildings that are often owner-occupied.

Sources

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

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, Missouri (place:54074, in state:29).

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_0001E, DP04_0001M, DP04_0007PE, DP04_0007PM, DP04_0008PE, DP04_0008PM, DP04_0009PE, DP04_0009PM, DP04_0010PE, DP04_0010PM, DP04_0011PE, DP04_0011PM, DP04_0012PE, DP04_0012PM, DP04_0013PE, DP04_0013PM, DP04_0014PE, DP04_0014PM, DP04_0015PE, DP04_0015PM

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.