What kinds of homes are in Rock Falls, IL?

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

Rock Falls, IL has 4,362 (±251) homes (2020–2024 American Community Survey).

That is about 1,095 homes per square mile of land.

77.4% are detached single-family houses.

12.4% are in buildings of two to four units.

8.4% are in buildings of five or more units.

Figures last updated on November 12, 2026.

Housing units: 4,362 (±251)
Detached houses: 77.4%
2–4 unit buildings: 12.4%
5+ unit buildings: 8.4%

Homes in Rock Falls by building size

Housing units by units in structure, 2020–2024
Building type	Rock Falls	Whiteside County	Illinois	United States
Single-family, detached	77.4% (±4.7 points)	81.5%	58.2%	61.3%
Single-family, attached (townhouse, rowhouse)	1.0% (±0.6 points)	1.9%	6.1%	6.2%
2 units	3.1% (±2.0 points)	3.9%	5.2%	3.4%
3 or 4 units	9.3% (±3.3 points)	3.6%	6.4%	4.3%
5 to 9 units	2.2% (±1.6 points)	2.5%	6.3%	4.5%
10 to 19 units	1.8% (±1.6 points)	1.0%	4.0%	4.3%
20 or more units	4.4% (±2.2 points)	3.0%	11.5%	10.3%
Mobile home	0.8% (±1.0 points)	2.3%	2.3%	5.6%
Boat, RV, van, etc.	0.0% (±0.9 points)	0.2%	0.0%	0.1%

In Rock Falls, the share of homes in buildings of five or more units is not measurably different from Whiteside County (6.5%).

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 Rock Falls

Nearest places with a published estimate, compared with Rock Falls
Place	Distance	Homes in buildings of 5 or more units	Compared with this place
Rock Falls	—	8.4% (±3.2 points)	—
Coloma Township	0.2 mi	7.4% (±2.7 points)	Not measurably different
Sterling	1.9 mi	12.9% (±2.5 points)	Higher
Sterling Township	2.9 mi	11.5% (±2.3 points)	Not measurably different
Montmorency Township	4.5 mi	0.4% (±5.2 points)	Lower
Nelson	4.8 mi	0.0% (±65.5 points)	Not measurably different
Hopkins Township	6.2 mi	0.8% (±6.1 points)	Lower
Nelson Township	6.4 mi	0.0% (±14.4 points)	Not measurably different
Hume Township	7.3 mi	0.0% (±27.4 points)	Not measurably different

Nearby places with a measurably lower figure: Montmorency Township, IL (0.4%), Hopkins Township, IL (0.8%).

Nearby places with a measurably higher figure: Sterling, IL (12.9%).

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 Whiteside County, place by place

Rank	Place	Homes in buildings of 5 or more units
1	Sterling	12.9% (±2.5 points)
2	Sterling Township	11.5% (±2.3 points)
3	Prophetstown	9.8% (±4.9 points)
4	Fulton Township	8.8% (±4.9 points)
5	Fulton	8.7% (±5.5 points)
6	Rock Falls	8.4% (±3.2 points)
7	Coloma Township	7.4% (±2.7 points)
8	Prophetstown Township	7.1% (±3.6 points)
9	Morrison	2.7% (±2.2 points)
10	Mount Pleasant Township	2.1% (±1.8 points)
11	Erie	1.9% (±7.4 points)
12	Erie Township	1.6% (±6.3 points)

Showing 12 of 33 places in Whiteside 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 Rock Falls

How many homes are in Rock Falls?

Rock Falls, IL has an estimated 4,362 (±251) housing units, occupied and vacant (2020–2024 American Community Survey).

Are most homes in Rock Falls houses or apartments?

77.4% are detached houses and 1.0% attached houses, while 20.8% are in buildings of two or more units.

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

12.4% of homes in Rock Falls 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 — Rock Falls 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 Rock Falls city, Illinois (place:64928, 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.