What kinds of homes are in Mount Sinai, NY?

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

Mount Sinai, NY has 4,192 (±276) homes (2020–2024 American Community Survey).

That is about 699 homes per square mile of land.

80.8% are detached single-family houses.

3.5% are in buildings of two to four units.

5.4% are in buildings of five or more units.

Figures last updated on November 12, 2026.

Housing units: 4,192 (±276)
Detached houses: 80.8%
2–4 unit buildings: 3.5%
5+ unit buildings: 5.4%

Homes in Mount Sinai by building size

Housing units by units in structure, 2020–2024
Building type	Mount Sinai	Suffolk County	New York	United States
Single-family, detached	80.8% (±4.2 points)	79.7%	41.2%	61.3%
Single-family, attached (townhouse, rowhouse)	10.2% (±3.3 points)	5.9%	5.5%	6.2%
2 units	0.8% (±0.7 points)	2.6%	9.6%	3.4%
3 or 4 units	2.7% (±2.3 points)	2.1%	6.9%	4.3%
5 to 9 units	0.7% (±0.8 points)	2.2%	5.2%	4.5%
10 to 19 units	2.1% (±2.6 points)	2.6%	4.4%	4.3%
20 or more units	2.6% (±2.3 points)	3.6%	25.1%	10.3%
Mobile home	0.0% (±1.0 points)	1.3%	2.1%	5.6%
Boat, RV, van, etc.	0.0% (±1.0 points)	0.0%	0.0%	0.1%

In Mount Sinai, the share of homes in buildings of five or more units is not measurably different from Suffolk County (8.4%).

It is also lower than in New York (34.7%).

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

Homes in buildings of 5 or more units in places near Mount Sinai

Nearest places with a published estimate, compared with Mount Sinai
Place	Distance	Homes in buildings of 5 or more units	Compared with this place
Mount Sinai	—	5.4% (±3.6 points)	—
Miller Place	1.4 mi	1.6% (±0.8 points)	Lower
Village of Port Jefferson	1.7 mi	14.1% (±4.1 points)	Higher
Port Jefferson Station	2.6 mi	13.5% (±5.8 points)	Higher
Terryville	2.7 mi	7.8% (±2.4 points)	Not measurably different
Village of Belle Terre	2.8 mi	0.0% (±24.8 points)	Not measurably different
Sound Beach	3.0 mi	0.2% (±2.0 points)	Lower
Village of Poquott	3.8 mi	0.0% (±16.3 points)	Not measurably different
East Setauket	4.1 mi	8.0% (±3.2 points)	Not measurably different

Nearby places with a measurably lower figure: Miller Place, NY (1.6%), Sound Beach, NY (0.2%).

Nearby places with a measurably higher figure: Village of Port Jefferson, NY (14.1%), Port Jefferson Station, NY (13.5%).

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 Suffolk County, place by place

Rank	Place	Homes in buildings of 5 or more units
48 (tie)	Selden	6.5% (±2.3 points)
48 (tie)	Shinnecock Hills	6.5% (±5.1 points)
51	Centereach	6.4% (±2.1 points)
52	Westhampton	5.8% (±3.6 points)
53	North Great River	5.7% (±3.2 points)
54 (tie)	Deer Park	5.4% (±1.8 points)
54 (tie)	Mount Sinai	5.4% (±3.6 points)
56	Hampton Bays	5.2% (±2.0 points)
57	Rocky Point	5.0% (±2.2 points)
58	Blue Point	4.2% (±3.1 points)
59	East Quogue	4.0% (±3.0 points)
60	Center Moriches	3.9% (±2.6 points)
61	Medford	3.8% (±1.7 points)

Showing 13 of 112 places in Suffolk County, ranked from highest to lowest.

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

It lies inside the Town of Brookhaven, 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 Mount Sinai

How many homes are in Mount Sinai?

Mount Sinai, NY has an estimated 4,192 (±276) housing units, occupied and vacant (2020–2024 American Community Survey).

Are most homes in Mount Sinai houses or apartments?

80.8% are detached houses and 10.2% attached houses, while 8.9% are in buildings of two or more units.

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

3.5% of homes in Mount Sinai 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 — Mount Sinai CDP, New York

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 Mount Sinai CDP, New York (place:49066, in state:36).

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.