What kinds of homes are in Iselin, NJ?

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

Iselin, NJ has 6,738 (±527) homes (2020–2024 American Community Survey).

That is about 2,138 homes per square mile of land.

69.0% are detached single-family houses.

1.5% are in buildings of two to four units.

26.6% are in buildings of five or more units.

Figures last updated on November 12, 2026.

Housing units: 6,738 (±527)
Detached houses: 69.0%
2–4 unit buildings: 1.5%
5+ unit buildings: 26.6%

Homes in Iselin by building size

Housing units by units in structure, 2020–2024
Building type	Iselin	Middlesex County	New Jersey	United States
Single-family, detached	69.0% (±3.7 points)	52.4%	52.6%	61.3%
Single-family, attached (townhouse, rowhouse)	2.8% (±1.7 points)	11.1%	10.0%	6.2%
2 units	0.2% (±0.4 points)	6.6%	8.6%	3.4%
3 or 4 units	1.3% (±1.1 points)	5.2%	6.1%	4.3%
5 to 9 units	4.3% (±1.9 points)	6.0%	4.6%	4.5%
10 to 19 units	9.6% (±3.3 points)	8.2%	4.9%	4.3%
20 or more units	12.7% (±3.0 points)	9.8%	12.3%	10.3%
Mobile home	0.0% (±0.7 points)	0.8%	0.9%	5.6%
Boat, RV, van, etc.	0.0% (±0.7 points)	0.0%	0.0%	0.1%

In Iselin, the share of homes in buildings of five or more units is not measurably different from Middlesex County (24.0%).

It is not measurably different from New Jersey (21.8%).

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

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

Nearest places with a published estimate, compared with Iselin
Place	Distance	Homes in buildings of 5 or more units	Compared with this place
Iselin	—	26.6% (±4.8 points)	—
Menlo Park Terrace	1.2 mi	12.4% (±7.4 points)	Lower
Colonia	1.4 mi	5.4% (±2.3 points)	Lower
Woodbridge	2.0 mi	40.6% (±6.8 points)	Higher
Fords	2.4 mi	18.8% (±5.1 points)	Lower
Avenel	2.5 mi	36.3% (±8.7 points)	Not measurably different
Metuchen Borough	3.1 mi	16.6% (±3.2 points)	Lower
Hopelawn	3.1 mi	22.1% (±14.0 points)	Not measurably different
Rahway	3.2 mi	31.7% (±3.9 points)	Not measurably different

Nearby places with a measurably lower figure: Menlo Park Terrace, NJ (12.4%), Colonia, NJ (5.4%), Fords, NJ (18.8%).

Nearby places with a measurably higher figure: Woodbridge, NJ (40.6%).

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 Middlesex County, place by place

Rank	Place	Homes in buildings of 5 or more units
4	Keasbey	53.6% (±20.2 points)
5	Plainsboro Center	46.7% (±17.0 points)
6	Woodbridge	40.6% (±6.8 points)
7	The Ponds	37.2% (±26.1 points)
8	Avenel	36.3% (±8.7 points)
9	Monmouth Junction	34.3% (±8.3 points)
10	Iselin	26.6% (±4.8 points)
11	Monroe Manor	22.2% (±15.1 points)
12	Hopelawn	22.1% (±14.0 points)
13	Heathcote	21.9% (±7.8 points)
14	Fords	18.8% (±5.1 points)
15	Sewaren	17.2% (±7.9 points)
16 (tie)	Cranbury	15.4% (±7.9 points)

Showing 13 of 32 places in Middlesex County, ranked from highest to lowest.

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

It lies inside Woodbridge Township, whose figures include it.

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 Iselin

How many homes are in Iselin?

Iselin, NJ has an estimated 6,738 (±527) housing units, occupied and vacant (2020–2024 American Community Survey).

Are most homes in Iselin houses or apartments?

69.0% are detached houses and 2.8% attached houses, while 28.1% are in buildings of two or more units.

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

1.5% of homes in Iselin 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 — Iselin CDP, New Jersey

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 Iselin CDP, New Jersey (place:34470, in state:34).

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.