Cos Cob vs Greenwich

A side-by-side comparison of Cos Cob and Greenwich: population, income, housing, and more.

Cos Cob and Greenwich are places in Connecticut. This page compares them across population, income, housing, education, commuting, and how each has changed since 2019.

Greenwich has the higher population (14,528 vs 7,354 in Cos Cob). Cos Cob has the higher median household income ($176,602 vs $136,154 in Greenwich). Greenwich has the higher median home value ($1,486,100 vs $1,149,500 in Cos Cob).

Population, income & housing

	Cos Cob	Greenwich
Population	7,354	14,528
Median age	39.3 yrs	44.0 yrs
Median household income	$176,602	$136,154
Median home value	$1,149,500	$1,486,100
Median gross rent	$2,574	$2,121
Housing units	2,711	6,684
Homeownership rate	65.4%	52.0%
Bachelor's degree or higher	70.3%	70.2%
Unemployment rate	6.1%	8.1%

Trends (ACS 5-year, 2019–2023)

	Cos Cob	Greenwich
Population	6,990 → 7,354 (+5.2%)	13,287 → 14,528 (+9.3%)
Median household income	$149,375 → $176,602 (+18.2%)	$109,500 → $136,154 (+24.3%)
Median home value	$1,055,400 → $1,149,500 (+8.9%)	$1,128,800 → $1,486,100 (+31.7%)
Median gross rent	$1,979 → $2,574 (+30.1%)	$1,803 → $2,121 (+17.6%)

Cos Cob

Population

6,9907,354

Median household income

$149,375$176,602

Median home value

$1,055,400$1,149,500

Median gross rent

$1,979$2,574

Greenwich

Population

13,28714,528

Median household income

$109,500$136,154

Median home value

$1,128,800$1,486,100

Median gross rent

$1,803$2,121

Age & race/ethnicity

Age distribution (share)

	Cos Cob	Greenwich
Under 5	9.0%	5.9%
5 to 17	20.0%	17.0%
18 to 24	6.1%	6.6%
25 to 34	8.6%	10.6%
35 to 44	15.2%	10.4%
45 to 54	13.3%	13.6%
55 to 64	13.9%	15.7%
65 to 74	8.9%	12.2%
75 and over	4.9%	8.0%

Race & ethnicity (share)

	Cos Cob	Greenwich
White (non-Hispanic)	67.2%	62.7%
Black or African American	2.9%	6.0%
American Indian & Alaska Native	0.4%	0.0%
Asian	5.4%	6.6%
Native Hawaiian & Pacific Islander	0.0%	0.0%
Some other race	0.8%	3.7%
Two or more races	9.2%	4.3%
Hispanic or Latino	14.2%	16.6%

Educational attainment (age 25+)

Share of adults 25+

	Cos Cob	Greenwich
No high school diploma	3.9%	5.0%
High school graduate	15.0%	10.1%
Some college or associate's	10.8%	14.7%
Bachelor's degree	33.4%	32.5%
Graduate or professional degree	36.9%	37.7%

Commute to work

How workers get to work (share)

	Cos Cob	Greenwich
Drove alone	54.8%	48.6%
Carpooled	4.9%	6.1%
Public transit	9.0%	15.3%
Walked	1.9%	8.2%
Bicycle	0.0%	0.0%
Worked from home	27.9%	20.5%
Other means	1.5%	1.2%

Housing

Units in structure (share)

	Cos Cob	Greenwich
1-unit, detached	58.2%	34.6%
1-unit, attached	11.8%	10.8%
2 to 4 units	23.5%	22.0%
5 to 19 units	5.1%	11.9%
20 or more units	1.1%	20.5%
Mobile home & other	0.2%	0.1%

Poverty & households

	Cos Cob	Greenwich
Poverty rate	5.5%	8.9%
Average household size	2.78	2.48
Mean commute (minutes)	29	30
Median year structure built	1959	1955