What kinds of homes are in Mountainside Borough, NJ?

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

Mountainside Borough, NJ has 2,567 (±122) homes (2020–2024 American Community Survey).

That is about 642 homes per square mile of land.

97.2% are detached single-family houses.

1.4% are in buildings of two to four units.

0.0% are in buildings of five or more units.

Figures last updated on November 12, 2026.

Housing units: 2,567 (±122)
Detached houses: 97.2%
2–4 unit buildings: 1.4%
5+ unit buildings: 0.0%

Homes in Mountainside Borough by building size

Housing units by units in structure, 2020–2024
Building type	Mountainside Borough	Union County	New Jersey	United States
Single-family, detached	97.2% (±2.0 points)	49.7%	52.6%	61.3%
Single-family, attached (townhouse, rowhouse)	1.4% (±1.7 points)	4.8%	10.0%	6.2%
2 units	0.7% (±1.1 points)	16.7%	8.6%	3.4%
3 or 4 units	0.7% (±1.2 points)	8.1%	6.1%	4.3%
5 to 9 units	0.0% (±1.7 points)	3.6%	4.6%	4.5%
10 to 19 units	0.0% (±1.7 points)	3.7%	4.9%	4.3%
20 or more units	0.0% (±1.7 points)	13.1%	12.3%	10.3%
Mobile home	0.0% (±1.7 points)	0.2%	0.9%	5.6%
Boat, RV, van, etc.	0.0% (±1.7 points)	0.1%	0.0%	0.1%

In Mountainside Borough, the share of homes in buildings of five or more units is lower than in Union County (20.4%).

It is also lower than in New Jersey (21.8%).

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

Homes in buildings of 5 or more units in places near Mountainside Borough

Nearest places with a published estimate, compared with Mountainside Borough
Place	Distance	Homes in buildings of 5 or more units	Compared with this place
Mountainside Borough	—	0.0% (±2.9 points)	—
Springfield Township (Union County)	1.8 mi	22.3% (±4.8 points)	Higher
Westfield Town	2.2 mi	6.7% (±1.8 points)	Higher
Summit	2.4 mi	18.1% (±4.5 points)	Higher
New Providence Borough	2.7 mi	22.4% (±4.2 points)	Higher
Garwood Borough	2.8 mi	17.2% (±6.8 points)	Higher
Fanwood Borough	3.0 mi	7.9% (±4.7 points)	Higher
Springfield	3.0 mi	16.1% (±17.7 points)	Not measurably different
Cranford	3.3 mi	45.3% (±15.9 points)	Higher

Nearby places with a measurably higher figure: Springfield Township (Union County), NJ (22.3%), Westfield Town, NJ (6.7%), Summit, NJ (18.1%).

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 Union County, place by place

Rank	Place	Homes in buildings of 5 or more units
14	Scotch Plains Township	12.3% (±2.1 points)
15	Fanwood Borough	7.9% (±4.7 points)
16 (tie)	Berkeley Heights Township	6.7% (±2.9 points)
16 (tie)	Westfield Town	6.7% (±1.8 points)
18	Hillside Township	6.3% (±2.5 points)
19	Kenilworth Borough	2.6% (±3.8 points)
20 (tie)	Mountainside Borough	0.0% (±2.9 points)
20 (tie)	Winfield Township	0.0% (±9.7 points)

Showing 8 of 21 places in Union 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 Mountainside Borough

How many homes are in Mountainside Borough?

Mountainside Borough, NJ has an estimated 2,567 (±122) housing units, occupied and vacant (2020–2024 American Community Survey).

Are most homes in Mountainside Borough houses or apartments?

97.2% are detached houses and 1.4% attached houses, while 1.4% are in buildings of two or more units.

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

1.4% of homes in Mountainside Borough 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 — Mountainside borough, Union County, 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 Mountainside borough, Union County, New Jersey (county subdivision:48510, in state:34 county:039).

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.