What kinds of homes are in Illiopolis Township, IL?

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

Illiopolis Township, IL has 616 (±102) homes (2020–2024 American Community Survey).

That is about 18 homes per square mile of land.

82.3% are detached single-family houses.

7.1% are in buildings of two to four units.

1.0% are in buildings of five or more units.

Figures last updated on November 12, 2026.

Housing units: 616 (±102)
Detached houses: 82.3%
2–4 unit buildings: 7.1%
5+ unit buildings: 1.0%

Homes in Illiopolis Township by building size

Housing units by units in structure, 2020–2024
Building type	Illiopolis Township	Sangamon County	Illinois	United States
Single-family, detached	82.3% (±10.1 points)	72.5%	58.2%	61.3%
Single-family, attached (townhouse, rowhouse)	0.5% (±0.9 points)	6.5%	6.1%	6.2%
2 units	3.7% (±3.6 points)	2.6%	5.2%	3.4%
3 or 4 units	3.4% (±2.8 points)	2.7%	6.4%	4.3%
5 to 9 units	1.0% (±1.6 points)	4.0%	6.3%	4.5%
10 to 19 units	0.0% (±5.9 points)	3.2%	4.0%	4.3%
20 or more units	0.0% (±5.9 points)	4.4%	11.5%	10.3%
Mobile home	9.1% (±9.9 points)	3.9%	2.3%	5.6%
Boat, RV, van, etc.	0.0% (±5.9 points)	0.0%	0.0%	0.1%

In Illiopolis Township, the share of homes in buildings of five or more units is lower than in Sangamon County (11.6%).

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 Illiopolis Township

Nearest places with a published estimate, compared with Illiopolis Township
Place	Distance	Homes in buildings of 5 or more units	Compared with this place
Illiopolis Township	—	1.0% (±8.5 points)	—
Illiopolis	1.0 mi	1.5% (±13.1 points)	Not measurably different
Lanesville Township	4.1 mi	0.0% (±59.2 points)	Not measurably different
Niantic Township	4.9 mi	5.0% (±12.4 points)	Not measurably different
Niantic	5.2 mi	6.2% (±15.1 points)	Not measurably different
Lake Fork Township	6.3 mi	0.0% (±79.7 points)	Not measurably different
Mount Auburn	6.6 mi	0.5% (±25.6 points)	Not measurably different
Mosquito Township	7.7 mi	0.0% (±35.0 points)	Not measurably different
Buffalo	7.8 mi	14.7% (±17.3 points)	Not measurably different

None of the nearby places differs measurably from this one on this figure.

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 Sangamon County, place by place

Rank	Place	Homes in buildings of 5 or more units
27	Pawnee Township	1.4% (±4.1 points)
28	Divernon	1.3% (±9.7 points)
29	Rochester Township	1.2% (±2.0 points)
30 (tie)	Grandview	1.0% (±8.5 points)
30 (tie)	Pleasant Plains	1.0% (±13.1 points)
30 (tie)	Divernon Township	1.0% (±7.4 points)
30 (tie)	Illiopolis Township	1.0% (±8.5 points)
34	Cartwright Township	0.8% (±10.0 points)
35	Ball Township	0.4% (±2.1 points)
36	Leland Grove	0.1% (±7.1 points)
37 (tie)	Berlin	0.0% (±67.4 points)
37 (tie)	Cantrall	0.0% (±71.9 points)
37 (tie)	Curran	0.0% (±67.9 points)

Showing 13 of 51 places in Sangamon 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 Illiopolis Township

How many homes are in Illiopolis Township?

Illiopolis Township, IL has an estimated 616 (±102) housing units, occupied and vacant (2020–2024 American Community Survey).

Are most homes in Illiopolis Township houses or apartments?

82.3% are detached houses and 0.5% attached houses, while 8.1% are in buildings of two or more units.

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

7.1% of homes in Illiopolis Township 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 — Illiopolis township, Sangamon County, 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 Illiopolis township, Sangamon County, Illinois (county subdivision:37140, in state:17 county:167).

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.