Cos Cob, Connecticut Population 2021

6,990
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Cos Cob is a city located in Fairfield County Connecticut. Cos Cob has a 2020 population of 6,990. Cos Cob is currently declining at a rate of 0.00% annually and its population has increased by 3.25% since the most recent census, which recorded a population of 6,770 in 2010. Cos Cob reached it's highest population of 6,990 in 2019.

The average household income in Cos Cob is $214,384 with a poverty rate of 6.54%. The median rental costs in recent years comes to $1,979 per month, and the median house value is $1.06 Mn. The median age in Cos Cob is 42.8 years, 40.3 years for males, and 45 years for females.

Cos Cob Demographics

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

  • White: 85.31%
  • Asian: 10.10%
  • Two or more races: 2.99%
  • Other race: 1.34%
  • Native American: 0.17%
  • Black or African American: 0.09%
  • Native Hawaiian or Pacific Islander: 0.00%
The current population of Cos Cob, Connecticut is 6,990 based on our projections of the latest US Census estimates. The US Census estimates the 2018 population at 6,959.The last official US Census in 2010 recorded the population at 6,770.

Cos Cob, Connecticut Population 2021

Population by Race

Race Population Percentage
White5,96385.31%
Asian70610.10%
Two or More Races2092.99%
Some Other Race941.34%
American Indian and Alaska Native120.17%
Black or African American60.09%
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Cos Cob Population by Race

Cos Cob Population Pyramid $2021

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Cos Cob Median Age

42.8


Total

40.3


Male

45


Female

Cos Cob Adults

There are 5,066 adults, (1,000 of whom are seniors) in Cos Cob.

Cos Cob Age Dependency

71.9

Age Dependency Ratio

24.6

Old Age Dependency Ratio

47.3

Child Dependency Ratio

Cos Cob Sex Ratio

Female

3,600

51.50%

Male

3,390

48.50%

Cos Cob Population by Age

Cos Cob Renter vs Owner Occupied by Household Type

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Cos Cob Household Types

Type Owner Renter
Married80.3%19.7%
All68.5%31.5%
Male62.4%37.6%
Non Family57.6%42.4%
Female35.6%64.4%

68.5%

Rate of Home Ownership

Cos Cob Households and Families

Type Count Average Size Owned
All2,5172.7668.5
Married1,4573.3580.3
Non Family6541.2557.6
Female2893.0435.6
Male1173.1862.4

3.2

Average Family Size

2.76

Average Household Size

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Cos Cob Households by Type

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Education Attained Count Percentage
Less Than 9th Grade1232.67%
9th to 12th Grade471.02%
High School Graduate59512.90%
Some College2976.44%
Associates Degree2655.75%
Bachelors Degree1,74437.81%
Graduate Degree1,54133.41%
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Cos Cob Educational Attainment by Sex (over 25)

Cos Cob Educational Attainment by Race

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Race Total High School Bachelors
White3,6463,5172,600
Asian473473381
Hispanic435394254
Other Race707033
2+ Races584930
Native American121212

The highest rate of high school graduation is among native american people with a rate of 100.00%.

The highest rate of bachelors degrees is among native american people with a rate of 100.00%.

Cos Cob Educational Attainment by Race

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Name Average Male Female
Overall$85,833$126,875$63,026
Less Than 9th Grade$$$
High School Graduate$29,352$42,292$
Some College$38,906$36,859$52,896
Bachelors Degree$94,561$151,944$69,417
Graduate Degree$137,143$213,229$81,302

$85,833

Average Earnings

$126,875

Average Male

$63,026

Average Female

Cos Cob Earnings by Educational Attainment

Cos Cob Language by Age

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Cos Cob Language

72.37% of Cos Cob residents speak only English, while 27.63% speak other languages. The non-English language spoken by the largest group is Asian and Pacific Island languages, which is spoken by 9.53% of the population.

Cos Cob Language

Cos Cob Poverty by Race

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Name Total In Poverty Poverty Rate
White5,2512835.39%
Hispanic82011814.39%
Asian695476.76%
Multiple209209.57%
Other911617.58%

6.54%

Overall Poverty Rate

5.62%

Male Poverty Rate

7.40%

Female Poverty Rate

Poverty in Cos Cob

The race most likely to be in poverty in Cos Cob is Other, with 17.58% below the poverty level.

The race least likely to be in poverty in Cos Cob is White, with 5.39% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 2.15%. Among those working part-time, it was 11.98%, and for those that did not work, the poverty rate was 9.68%.

Cos Cob Poverty

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Name Poverty
Some College16.37%
Less Than 9th Grade11.76%
High School4.20%
Bachelors or Greater4.14%

Cos Cob Poverty Rate by Education

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Rate Poverty
Female Employed6.77%
Female Unemployed4.55%
Male Unemployed4.12%
Male Employed2.94%

Cos Cob Poverty Rate by Employment Status and Sex

Cos Cob Income by Household Type

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Name Median Mean
Households$149,375$214,384
Families$202,917$252,964
Married Families$226,875-
Non Families$76,071$102,101
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Income by Household Type

Cos Cob Marital Status

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Marriage Rates

53.7%

Overall Marriage Rate

56.5%

Male Marriage Rate

51.3%

Female Marriage Rate

Cos Cob Married by Age and Sex

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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

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Cos Cob Marital Status

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189

Number of Veterans

165

Male Veterans

24

Female Veterans

War Veterans
Vietnam83
First Gulf War24
Korea22
World War II15
Second Gulf War

Cos Cob Veterans by War

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Age Group Veterans
65 to 7482
75+61
55 to 6439
35 to 547
18 to 34

Cos Cob Veterans by Age

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Cos Cob Veterans by Race

Cos Cob Veterans by Education

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0.00%

Veteran Poverty Rate

27.51%

Veteran Disability Rate

Cos Cob Veterans by Education

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68%

Labor Force Participation

64.6%

Employment Rate

5.1%

Unemployment Rate

Cos Cob Employment by Age

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Cos Cob Employment by Race

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Cos Cob Employment by Education

Origin of Non-Citizens

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

Origin of Naturalized Citizens

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34.43%

Born in Cos Cob

77.07%

Native Born

22.93%

Foreign Born

11.87%

Non Citizen

11.06%

Naturalized

Place of Birth

77.07% of Cos Cob residents were born in the United States, with 34.43% having been born in Connecticut. 11.87% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

Cos Cob Place of Birth

Year Population Growth Annual Growth Rate
20216,9900.00%
20206,9900.00%
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%
20106,7700.00%

Cos Cob Population by Year