What kinds of homes are in Illiopolis, IL?

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

Illiopolis, IL has 392 (±59) homes (2020–2024 American Community Survey).

That is about 579 homes per square mile of land.

82.7% are detached single-family houses.

11.3% are in buildings of two to four units.

1.5% are in buildings of five or more units.

Figures last updated on November 12, 2026.

Housing units: 392 (±59)
Detached houses: 82.7%
2–4 unit buildings: 11.3%
5+ unit buildings: 1.5%

Homes in Illiopolis by building size

Housing units by units in structure, 2020–2024
Building type	Illiopolis	Sangamon County	Illinois	United States
Single-family, detached	82.7% (±6.8 points)	72.5%	58.2%	61.3%
Single-family, attached (townhouse, rowhouse)	0.8% (±1.4 points)	6.5%	6.1%	6.2%
2 units	5.9% (±5.7 points)	2.6%	5.2%	3.4%
3 or 4 units	5.4% (±4.3 points)	2.7%	6.4%	4.3%
5 to 9 units	1.5% (±2.5 points)	4.0%	6.3%	4.5%
10 to 19 units	0.0% (±9.1 points)	3.2%	4.0%	4.3%
20 or more units	0.0% (±9.1 points)	4.4%	11.5%	10.3%
Mobile home	3.8% (±2.8 points)	3.9%	2.3%	5.6%
Boat, RV, van, etc.	0.0% (±9.1 points)	0.0%	0.0%	0.1%

In Illiopolis, the share of homes in buildings of five or more units is not measurably different from 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

Nearest places with a published estimate, compared with Illiopolis
Place	Distance	Homes in buildings of 5 or more units	Compared with this place
Illiopolis	—	1.5% (±13.1 points)	—
Illiopolis Township	1.0 mi	1.0% (±8.5 points)	Not measurably different
Lanesville Township	4.5 mi	0.0% (±59.2 points)	Not measurably different
Niantic Township	4.6 mi	5.0% (±12.4 points)	Not measurably different
Niantic	4.6 mi	6.2% (±15.1 points)	Not measurably different
Mount Auburn	5.8 mi	0.5% (±25.6 points)	Not measurably different
Mosquito Township	6.8 mi	0.0% (±35.0 points)	Not measurably different
Lake Fork Township	6.8 mi	0.0% (±79.7 points)	Not measurably different
Buffalo	8.3 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
19 (tie)	Loami	2.3% (±15.2 points)
19 (tie)	Woodside Township	2.3% (±1.3 points)
21	Springfield Township	1.8% (±1.8 points)
22	Rochester	1.7% (±3.0 points)
23 (tie)	Pawnee	1.6% (±4.4 points)
23 (tie)	Loami Township	1.6% (±10.6 points)
25 (tie)	Illiopolis	1.5% (±13.1 points)
25 (tie)	Williams Township	1.5% (±3.0 points)
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)

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

How many homes are in Illiopolis?

Illiopolis, IL has an estimated 392 (±59) housing units, occupied and vacant (2020–2024 American Community Survey).

Are most homes in Illiopolis houses or apartments?

82.7% are detached houses and 0.8% attached houses, while 12.8% are in buildings of two or more units.

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

11.3% of homes in Illiopolis 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 village, 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 village, Illinois (place:37127, 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.