Cos Cob, Connecticut Population 2024

7,243

Cos Cob is a city located in Fairfield County Connecticut. Cos Cob has a 2024 population of 7,243. Cos Cob is currently declining at a rate of annually and its population has increased by 2.52% since the most recent census, which recorded a population of 7,065 in 2020.

The average household income in Cos Cob is $261,845 with a poverty rate of 5.69%. The median rental costs in recent years comes to - per month, and the median house value is -. The median age in Cos Cob is 39.7 years, 41.5 years for males, and 38.4 years for females.

Cos Cob Demographics

According to the most recent ACS, the racial composition of Cos Cob was:

  • White: 73.2%
  • Two or more races: 11.2%
  • Other race: 7.25%
  • Asian: 5.01%
  • Black or African American: 3.01%
  • Native American: 0.33%
  • Native Hawaiian or Pacific Islander:
Land Area (mi²)
2.1 sq mi
Density (mi²)
3,488.50/sq mi
Growth Since 2020
2.52% (178)
The current population of Cos Cob, Connecticut is 7,243 based on our projections of the latest US Census estimates.The last official US Census in 2020 recorded the population at 7,065.

Cos Cob, Connecticut Population 2024

Population by Race

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Race
Population
Percentage (of total)
White5,30273.2%
Two or more races81111.2%
Other race5257.25%
Asian3635.01%
Black or African American2183.01%
Native American240.33%
Native Hawaiian or Pacific Islander
showing: 7 rows

White

Two or more races

Other race

Asian

Black or African American

Native American

Native Hawaiian or Pacific Islander

Cos Cob Population by Race

Cos Cob Population Pyramid 2024

Cos Cob Median Age

39.7

Total

41.5

Male

38.4

Female

Cos Cob Adults

There are 5,202 adults, (1,051 of whom are seniors) in Cos Cob.

Cos Cob Age Dependency

74.5

Age Dependency Ratio

25.3

Old Age Dependency Ratio

49.2

Child Dependency Ratio

Cos Cob Sex Ratio

Female3,78152.2%
Male3,46247.8%

Cos Cob Population by Age

Cos Cob Renter vs Owner Occupied by Household Type

Household Type
Count
Average Size
Owner
Renter
All2,5532.826634
Married1,7513.2573.126.9
Non Family5401.1258.341.7
Female2183.4832.167.9
Male443.547.752.3
showing: 5 rows

3.21

Average Family Size

2.82

Average Household Size

66.0%

Rate of Home Ownership

Married

Male

Female

NonFamily

owner

renter

Cos Cob Households and Families

Male

Female

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Less Than 9th Grade

9th to 12th Grade

High School Graduate

Some College

Associates Degree

Bachelors Degree

Graduate Degree

Cos Cob Educational Attainment by Sex (over 25)

Cos Cob Educational Attainment by Race

High School Graduation Rate

Bachelors Rate

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The highest rate of high school graduation is among black people with a rate of 100%.

The highest rate of bachelors degrees is among asian people with a rate of 94.44%.

Cos Cob Educational Attainment by Race

All

Male

Female

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$91,190

Average Earnings

$122,857

Average Male

$80,185

Average Female

Cos Cob Earnings by Educational Attainment

Cos Cob Language by Age

Only English

Spanish

Other Indo-European Languages

Asian and Pacific Island Languages

Other Languages

Cos Cob Language

74.9% of Cos Cob residents speak only English, while 25.1% speak other languages. The non-English language spoken by the largest group is Other Indo-European, which is spoken by 14.25% of the population.

Cos Cob Language

Cos Cob Poverty by Race

rate

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Name
Total
In Poverty
Poverty Rate
Hispanic1,03622021.24%
White4,9361923.89%
Other52313626%
Multiple811263.21%
showing: 4 rows

5.69%

Overall Poverty Rate

6.05%

Male Poverty Rate

5.37%

Female Poverty Rate

Poverty in Cos Cob

The race most likely to be in poverty in Cos Cob is Other, with 26% below the poverty level.

The race least likely to be in poverty in Cos Cob is Multiple, with 3.21% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 2.07%. Among those working part-time, it was 11.16%, and for those that did not work, the poverty rate was 6.4%.

Cos Cob Poverty

rate

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Rate
Poverty
Less Than 9th Grade13.91%
Some College9.36%
Bachelors or Greater3.41%
High School1.01%
showing: 4 rows

Cos Cob Poverty Rate by Education

rate

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Rate
Poverty
Male Unemployed14.67%
Male Employed5.27%
Female Unemployed4%
Female Employed3.92%
showing: 4 rows

Cos Cob Poverty Rate by Employment Status and Sex

Cos Cob Income by Household Type

Households

Families

MarriedFamilies

NonFamilies

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mean

median

Income by Household Type

Cos Cob Marital Status

Married

Widowed

Divorced

Separated

NeverMarried

Marriage Rates

61.9%

Overall Marriage Rate

66.5%

Male Marriage Rate

57.7%

Female Marriage Rate

Cos Cob Married by Age and Sex

male

female

Cos Cob Marriage

The age group where males are most likely to be married is 45-54, while the female age group most likely to be married is 35-44.

Cos Cob Marital Status by Race

Married

Widowed

Divorced

Separated

NeverMarried

Cos Cob Marital Status

Second Gulf War

First Gulf War

Vietnam

Korea

World War II

203

Number of Veterans

185

Male Veterans

18

Female Veterans

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Cos Cob Veterans by War

count

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Cos Cob Veterans by Age

count

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Cos Cob Veterans by Race

Cos Cob Veterans by Education

Less Than 9th Grade

High School Graduate

Some College

Bachelors or Greater

1.97%

Veteran Poverty Rate

20.2%

Veteran Disability Rate

Cos Cob Veterans by Education

LaborForceParticipation

70.7%

Labor Force Participation

66.2%

Employment Rate

6.3%

Unemployment Rate

Cos Cob Employment by Age

LaborForceParticipation

Cos Cob Employment by Race

LaborForceParticipation

Cos Cob Employment by Education

Origin of Non-Citizens

Europe

Asia

Africa

Oceania

Latin America

North America

Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.

Origin of Naturalized Citizens

Europe

Asia

Africa

Oceania

Latin America

North America

35.66%

Born in Cos Cob

74.51%

Native Born

25.49%

Foreign Born

11.24%

Non Citizen

14.25%

Naturalized

Place of Birth

74.51% of Cos Cob residents were born in the United States, with 35.66% having been born in Connecticut. 11.24% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.

Cos Cob Place of Birth

Note: data after 2022 is projected based on recent change

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Year
Population
Growth
Growth Rate
20247,243
20237,243
20227,2431542.17%
20217,089240.34%
20207,065751.07%
20196,990310.45%
20186,9591191.74%
20176,8403054.67%
20166,5351021.59%
20156,4331682.68%
20146,265-81-1.28%
20136,346-259-3.92%
20126,605630.96%
20116,542-228-3.37%
20106,770
showing: 15 rows

Cos Cob Population by Year