What kinds of homes are in Alton, IL?

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

Alton, IL has 12,551 (±431) homes (2020–2024 American Community Survey).

That is about 801 homes per square mile of land.

75.3% are detached single-family houses.

10.1% are in buildings of two to four units.

9.9% are in buildings of five or more units.

Figures last updated on November 12, 2026.

Housing units: 12,551 (±431)
Detached houses: 75.3%
2–4 unit buildings: 10.1%
5+ unit buildings: 9.9%

Homes in Alton by building size

Housing units by units in structure, 2020–2024
Building type	Alton	Madison County	Illinois	United States
Single-family, detached	75.3% (±2.3 points)	78.9%	58.2%	61.3%
Single-family, attached (townhouse, rowhouse)	2.0% (±0.9 points)	2.9%	6.1%	6.2%
2 units	5.3% (±1.2 points)	3.1%	5.2%	3.4%
3 or 4 units	4.8% (±1.5 points)	5.0%	6.4%	4.3%
5 to 9 units	2.2% (±1.0 points)	2.4%	6.3%	4.5%
10 to 19 units	1.6% (±0.9 points)	2.1%	4.0%	4.3%
20 or more units	6.1% (±1.2 points)	3.4%	11.5%	10.3%
Mobile home	2.8% (±0.9 points)	2.2%	2.3%	5.6%
Boat, RV, van, etc.	0.0% (±0.3 points)	0.0%	0.0%	0.1%

In Alton, the share of homes in buildings of five or more units is higher than in Madison County (7.9%).

It is also lower than in Illinois (21.8%).

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

Homes in buildings of 5 or more units in places near Alton

Nearest places with a published estimate, compared with Alton
Place	Distance	Homes in buildings of 5 or more units	Compared with this place
Alton	—	9.9% (±1.8 points)	—
Alton Township	0.0 mi	9.9% (±1.8 points)	Not measurably different
East Alton	2.7 mi	3.8% (±3.4 points)	Lower
West Alton	4.0 mi	0.0% (±25.6 points)	Not measurably different
Rosewood Heights	4.3 mi	0.0% (±3.6 points)	Lower
Wood River Township	4.4 mi	6.0% (±1.7 points)	Lower
Wood River	4.9 mi	10.9% (±3.9 points)	Not measurably different
Foster Township (Madison County)	5.1 mi	1.5% (±3.7 points)	Lower
Godfrey	5.1 mi	4.0% (±2.0 points)	Lower

Nearby places with a measurably lower figure: East Alton, IL (3.8%), Rosewood Heights, IL (0.0%), Wood River Township, IL (6.0%).

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 Madison County, place by place

Rank	Place	Homes in buildings of 5 or more units
4	Collinsville	11.9% (±2.8 points)
5	Saline Township	11.6% (±4.2 points)
6	Bethalto	11.3% (±3.9 points)
7	Wood River	10.9% (±3.9 points)
8	Livingston	10.5% (±13.9 points)
9	Glen Carbon	10.3% (±2.9 points)
10 (tie)	Alton	9.9% (±1.8 points)
10 (tie)	Alton Township	9.9% (±1.8 points)
12	Fort Russell Township	9.6% (±3.7 points)
13 (tie)	South Roxana	8.8% (±7.2 points)
13 (tie)	Helvetia Township	8.8% (±4.0 points)
15	Collinsville Township	8.2% (±1.8 points)
16	Granite City Township	8.0% (±2.3 points)

Showing 13 of 53 places in Madison 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 Alton

How many homes are in Alton?

Alton, IL has an estimated 12,551 (±431) housing units, occupied and vacant (2020–2024 American Community Survey).

Are most homes in Alton houses or apartments?

75.3% are detached houses and 2.0% attached houses, while 20.0% are in buildings of two or more units.

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

10.1% of homes in Alton 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 — Alton 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 Alton city, Illinois (place:01114, 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_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.