What kinds of homes are in Cos Cob, CT?

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

Cos Cob, CT has 2,836 (±287) homes (2020–2024 American Community Survey).

That is about 1,318 homes per square mile of land.

61.2% are detached single-family houses.

21.7% 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: 2,836 (±287)
Detached houses: 61.2%
2–4 unit buildings: 21.7%
5+ unit buildings: 8.4%

Homes in Cos Cob by building size

Housing units by units in structure, 2020–2024
Building type	Cos Cob	Western Connecticut Planning Region	Connecticut	United States
Single-family, detached	61.2% (±7.5 points)	57.3%	58.6%	61.3%
Single-family, attached (townhouse, rowhouse)	8.6% (±3.9 points)	7.4%	6.5%	6.2%
2 units	14.5% (±6.4 points)	6.2%	7.5%	3.4%
3 or 4 units	7.2% (±4.1 points)	5.8%	8.1%	4.3%
5 to 9 units	4.2% (±2.9 points)	4.2%	4.9%	4.5%
10 to 19 units	2.8% (±2.7 points)	3.5%	3.5%	4.3%
20 or more units	1.4% (±1.3 points)	15.2%	10.2%	10.3%
Mobile home	0.2% (±0.3 points)	0.4%	0.7%	5.6%
Boat, RV, van, etc.	0.0% (±1.5 points)	0.0%	0.0%	0.1%

In Cos Cob, the share of homes in buildings of five or more units is lower than in Western Connecticut Planning Region (22.9%).

It is also lower than in Connecticut (18.6%).

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

Homes in buildings of 5 or more units in places near Cos Cob

Nearest places with a published estimate, compared with Cos Cob
Place	Distance	Homes in buildings of 5 or more units	Compared with this place
Cos Cob	—	8.4% (±4.2 points)	—
Riverside	1.3 mi	6.9% (±2.7 points)	Not measurably different
Greenwich (community)	2.3 mi	30.9% (±4.9 points)	Higher
Old Greenwich	2.3 mi	10.5% (±5.8 points)	Not measurably different
Stamford	3.2 mi	43.7% (±1.9 points)	Higher
Glenville	3.9 mi	7.7% (±5.4 points)	Not measurably different
Pemberwick	4.0 mi	9.4% (±6.0 points)	Not measurably different
Byram	4.6 mi	11.6% (±5.2 points)	Not measurably different
Village of Port Chester	5.0 mi	37.8% (±4.4 points)	Higher

Nearby places with a measurably higher figure: Greenwich (community), CT (30.9%), Stamford, CT (43.7%), Village of Port Chester, NY (37.8%).

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 Western Connecticut Planning Region, place by place

Rank	Place	Homes in buildings of 5 or more units
9	Ridgefield (community)	18.4% (±6.1 points)
10	Westport Village	16.4% (±8.7 points)
11	Bethel (community)	15.0% (±4.7 points)
12	Byram	11.6% (±5.2 points)
13	Old Greenwich	10.5% (±5.8 points)
14	Pemberwick	9.4% (±6.0 points)
15	Cos Cob	8.4% (±4.2 points)
16	Glenville	7.7% (±5.4 points)
17	Riverside	6.9% (±2.7 points)
18	Staples	5.4% (±3.6 points)
19	Noroton Heights	4.0% (±6.1 points)
20	Lakes East	2.7% (±12.6 points)
21	Sandy Hook	2.5% (±2.0 points)

Showing 13 of 33 places in Western Connecticut Planning Region, ranked from highest to lowest.

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

It lies inside Greenwich, 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 Cos Cob

How many homes are in Cos Cob?

Cos Cob, CT has an estimated 2,836 (±287) housing units, occupied and vacant (2020–2024 American Community Survey).

Are most homes in Cos Cob houses or apartments?

61.2% are detached houses and 8.6% attached houses, while 30.1% are in buildings of two or more units.

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

21.7% of homes in Cos Cob 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 — Cos Cob CDP, Connecticut

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 Cos Cob CDP, Connecticut (place:17520, in state:09).

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.