What kinds of homes are in Affton, MO?

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

Affton, MO has 9,092 (±537) homes (2020–2024 American Community Survey).

That is about 1,989 homes per square mile of land.

83.0% are detached single-family houses.

6.5% are in buildings of two to four units.

8.2% are in buildings of five or more units.

Figures last updated on November 12, 2026.

Housing units: 9,092 (±537)
Detached houses: 83.0%
2–4 unit buildings: 6.5%
5+ unit buildings: 8.2%

Homes in Affton by building size

Housing units by units in structure, 2020–2024
Building type	Affton	St. Louis County	Missouri	United States
Single-family, detached	83.0% (±2.3 points)	72.0%	70.5%	61.3%
Single-family, attached (townhouse, rowhouse)	1.8% (±0.7 points)	4.6%	3.7%	6.2%
2 units	1.2% (±1.0 points)	1.5%	3.2%	3.4%
3 or 4 units	5.3% (±1.6 points)	4.9%	4.6%	4.3%
5 to 9 units	4.0% (±1.2 points)	5.6%	3.6%	4.5%
10 to 19 units	1.6% (±0.9 points)	4.7%	3.4%	4.3%
20 or more units	2.6% (±1.0 points)	6.3%	5.8%	10.3%
Mobile home	0.5% (±0.6 points)	0.3%	5.2%	5.6%
Boat, RV, van, etc.	0.0% (±0.4 points)	0.0%	0.1%	0.1%

In Affton, the share of homes in buildings of five or more units is lower than in St. Louis County (16.6%).

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 Affton

Nearest places with a published estimate, compared with Affton
Place	Distance	Homes in buildings of 5 or more units	Compared with this place
Affton	—	8.2% (±1.8 points)	—
Lakeshire	0.9 mi	12.8% (±7.2 points)	Not measurably different
Wilbur Park	1.0 mi	0.0% (±24.2 points)	Not measurably different
St. George	1.2 mi	44.4% (±19.1 points)	Higher
Marlborough	1.4 mi	54.5% (±15.7 points)	Higher
Grantwood Village	1.5 mi	0.0% (±14.5 points)	Not measurably different
Green Park	1.9 mi	8.4% (±5.1 points)	Not measurably different
Bella Villa	2.3 mi	0.0% (±17.3 points)	Not measurably different
Lemay	2.5 mi	8.6% (±2.9 points)	Not measurably different

Nearby places with a measurably higher figure: St. George, MO (44.4%), Marlborough, MO (54.5%).

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. Louis County, place by place

Rank	Place	Homes in buildings of 5 or more units
43	Rock Hill	9.2% (±6.2 points)
44	Crestwood	8.7% (±3.8 points)
45	Lemay	8.6% (±2.9 points)
46	Concord	8.5% (±2.5 points)
47	Green Park	8.4% (±5.1 points)
48	Eureka	8.3% (±3.8 points)
49	Affton	8.2% (±1.8 points)
50	Pagedale	7.6% (±4.1 points)
51	Oakland	7.1% (±8.9 points)
52	Ballwin	6.8% (±1.7 points)
53	Dellwood	6.4% (±9.2 points)
54	Edmundson	6.3% (±5.4 points)
55	Moline Acres	5.4% (±6.3 points)

Showing 13 of 98 places in St. Louis County, ranked from highest to lowest.

Affton is a census-designated place: an unincorporated community the Census Bureau draws for statistics, with no municipal government of its own.

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 Affton

How many homes are in Affton?

Affton, MO has an estimated 9,092 (±537) housing units, occupied and vacant (2020–2024 American Community Survey).

Are most homes in Affton houses or apartments?

83.0% are detached houses and 1.8% attached houses, while 14.7% are in buildings of two or more units.

How many two-family and small multifamily homes are in Affton?

6.5% of homes in Affton 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 — Affton CDP, 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 Affton CDP, Missouri (place:00280, 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.