Cos Cob, CT demographics:
population, income, and more

Total population
7,546
2.6% year-over-year change
Median household income
$190,481/yr
7.9% year-over-year change
Housing units
2,836
4.6% year-over-year change

Cos Cob population

How many people live in Cos Cob

Cos Cob is home to 7,546 residents, according to the most recent Census data. Gender-wise, 48.3% of Cos Cob locals are male, and 51.7% are female.

Total population
7,546
2.6% year-over-year change
Gender ratio
Male
48.3%
3,645
Female
51.7%
3,901
Value Percent YoY change
Male 3,645 48.3% 2.0%
Female 3,901 51.7% 3.2%
A higher population often means more rental variety and livelier areas. The gender balance—how many men live here compared to women—can reveal a lot about the community and the lifestyles of its residents. Use this info to get a sense of the area's pace and personality.

Age demographics

The median age in Cos Cob is 40, with the population distributed as follows: about 21.3% are children under 15, then 13.2% are in the 15 to 24 age group. Adults between 25 and 44 make up 23.8% of the population, while another 26.2% fall into the 45 to 64 bracket. Finally, around 15.4% are 65 or older.

Median age
39.6
Age breakdown
Under 15
21.3%
15 to 24
13.2%
25 to 44
23.8%
45 to 64
26.2%
Over 65
15.4%
Value Percent YoY change
Under 15 1,608 21.3% 2.5%
15 to 24 999 13.2% -1.4%
25 to 44 1,793 23.8% 2.2%
45 to 64 1,980 26.2% -1.1%
Over 65 1,166 15.4% 14.8%
The age composition helps you get insight into who lives in the area. A younger population might mean a more active, fast-paced vibe, while an older one could suggest a quieter, slower lifestyle. If there's a balanced makeup, you’re likely to find a variety of services, housing types, and community spaces that cater to different life stages.

Racial makeup

In Cos Cob, 74.4% of the population are US-born citizens, while 12.7% have gained naturalized citizenship. At the same time, 12.9% of residents are non-citizens. As for race, 68.3% of locals are Caucasian, 3.1% are African American and 6.6% have Asian roots. There’s also a share of 14.8% that includes residents with two or more races.

Citizenship
U.S.-born citizens
74.4%
Non-U.S.-born citizens
12.7%
Non-citizens
12.9%
Value Percent YoY change
U.S.-born citizens 5,615 74.4% 2.6%
Non-U.S.-born citizens 959 12.7% -4.5%
Non-citizens 972 12.9% 10.8%
Racial breakdown
White
68.3%
Black or African American
3.1%
American Indian and Alaska Native
0.3%
Asian
6.6%
Native Hawaiian and other Pacific Islander
0%
Two or more races
14.8%
Other
6.9%
Value Percent
White 5,157 68.3%
Black or African American 237 3.1%
American Indian and Alaska Native 21 0.3%
Asian 494 6.6%
Two or more races 1,114 14.8%
Other 523 6.9%

Households in Cos Cob

A peek inside Cos Cob households

Cos Cob has 2,747 households, with an average of 3 members in each. Of these, 77.2% are families, while the remaining 22.8% are made up of individuals living alone or with non-relatives, such as roommates.

Households stats

Total households
2,747
4.2% year-over-year change
Average people per household
3
Non-family households
626
Family households
2,121
Value Percent YoY change
Non-family households 626 22.8% 7.0%
Family households 2,121 77.2% 3.5%
The mix between family and non-family households gives a glimpse into daily life. A higher percentage of families might mean more parks and schools, while more non-family setups can mean flexible housing and diverse living styles. For renters, this can signal what kinds of homes are common and can help you figure out if the area matches your lifestyle.

Housing in Cos Cob

The housing landscape of Cos Cob

Cos Cob's housing consists of 2,836 units, with 61.2% being detached single-family homes ideal for those wanting space. Attached options, including duplexes and townhouses, make up 8.6% and offer a more compact, shared living style. Then there are the multifamily buildings in the area, and for those seeking flexibility, non-traditional options like mobile homes account for 0.2% of the housing landscape.

Housing units
2,836
4.6% year-over-year change
Housing types
Value Percent
1 unit, detached 1,736 61.2%
1 unit, attached 243 8.6%
2 units 411 14.5%
3 or 4 units 203 7.2%
5 to 9 units 118 4.2%
10 to 19 units 78 2.8%
20 to 49 units 35 1.2%
50 or more units 6 0.2%
Mobile home 6 0.2%
Homes built since 2020
0
% year-over-year change

The age of buildings in Cos Cob

In Cos Cob, the median construction year is 1959. About 28.1% of homes were built before the 1940s, with another 3.5% going up by 1949. Most development happened in the second half of the 20th century.

Construction year breakdown by decade
Value Percent YoY change
Built in 1939 or earlier 798 28.1% 5.6%
Built between 1940 and 1949 100 3.5% 35.1%
Built between 1950 and 1959 552 19.5% -2.1%
Built between 1960 and 1969 211 7.4% -16.9%
Built between 1970 and 1979 373 13.2% 15.8%
Built between 1980 and 1989 298 10.5% 27.4%
Built between 1990 and 1999 172 6.1% 34.4%
Built between 2000 and 2009 71 2.5% -47.4%
Built between 2010 and 2019 261 9.2% 7.0%
As a renter, knowing when homes were built helps you understand the potential condition and design of rental units. Newer builds may have more contemporary layouts, while older homes can offer character or larger lots, depending on the area.

Cos Cob occupancy rates

Out of the 2,747 occupied housing units in Cos Cob, 66.7% are owner-occupied, while 33.3% are lived in by tenants. Meanwhile, 3.1% of all homes on the local market sit vacant.

Occupied housing units
2,747
4.2% year-over-year change
Occupancy breakdown
Renter occupied
914
Owner occupied
1,833
Value Percent YoY
change
Renter occupied 914 33.3% 0.3%
Owner occupied 1,833 66.7% 6.3%
Unoccupied housing units
3.1%
Unoccupied housing units refer to homes that are currently without residents—whether they're waiting for renters or owners, used seasonally, or simply unclaimed. A higher share of empty homes may mean more housing availability, while a low number can reflect a tighter market with more competition. This, along with the renter-vs.-owner mix, helps paint a clearer picture of what types of housing and services are likely to be available in the area.

Cos Cob housing costs

Housing costs in Cos Cob come to a median of $3,298 per month, while tenants specifically pay a median gross rent of $3,067.

Median housing costs per month
$3,298/month
This figure sums up typical monthly housing costs for all households in the area. If you own, it includes mortgage payments in addition to property taxes, insurance and HOA fees. If you rent, it accounts for rent plus extras like utilities. It’s useful for seeing how local living expenses stack up compared to other places.
Median gross rent in Cos Cob
$3,067/month
Gross rent gives a more complete look at what renters actually pay, including not just base rent, but also utilities and fees. It’s a key number for evaluating rental affordability in your area of interest and understanding how it compares to nearby locations.

Education in Cos Cob

Cos Cob education at a glance

About 18.3% of the population in Cos Cob went to high school, while 8.2% pursued college studies. Another 5.1% earned an associate degree and 32.4% hold a bachelor’s. Meanwhile, 34.8% went even further, earning a master’s or doctorate.

Education level
Value Percent YoY change
No high school 59 1.1% 13.5%
High school diploma 978 18.3% -2.1%
College diploma 439 8.2% 7.3%
Associate degree 270 5.1% 11.6%
Bachelor's degree 1,732 32.4% 2.1%
Graduate degree 1,860 34.8% 2.1%
A community’s education mix can offer insights into the local economy and housing market. Higher levels of education often align with more job opportunities and stable incomes, which can increase demand for homes and influence both rent prices and rental availability.

Income in Cos Cob

How much people earn in Cos Cob

The average annual household income in Cos Cob was $289,307 in 2024, the most recent annual data available, according to the U.S. Census Bureau. This marked a +4.9% change from the previous year. At the same time, the median income stood at $190,481, reflecting a +7.9% shift over the same period.

Average household income in Cos Cob
$289,307/year
4.9% year-over-year change
Median household income in Cos Cob
$190,481/year
7.9% year-over-year change

Cos Cob income by age

In Cos Cob, households led by residents aged 25 to 44 — usually in the early to mid stages of their careers — have a median income of $184,881. Those with someone between 45 and 64 in charge, often well established professionally, earn $219,833 overall. Overall, 94.2% of the locals in this community live above the poverty line.

Income breakdown by age
Value YoY change
25 - 44 $184,881 -13.5%
45 - 64 $219,833 -1.2%
Over 65 $112,458 3.1%
Above poverty level
6,886
Below poverty level
421
Value Percent YoY
change
Above poverty level 6,886 94.2% 2.7%
Below poverty level 421 5.8% 4.5%

Average renter income in Cos Cob

To get a better sense of what renters earn on average in Cos Cob, their median household income was $102,550 according to 2022 Census data. In addition, the rent-to-income ratio in the area, at 35.9%, shows what portion of their earnings goes toward housing expenses.

Renter median household income
$102,550
Rent-to-income ratio
35.9%
Understanding the rent-to-income ratio can help renters gauge if local housing costs align with their earnings. A ratio under 30% usually signals affordability, while exceeding this mark means rent is taking a larger-than-recommended bite out of income. That could make it harder for you to cover other costs like transportation, healthcare, or child care.

Employment in Cos Cob

Workforce and job types in Cos Cob

The job market in Cos Cob is powered by 3,807 working residents, spread across a range of industries and roles. 88.8% of the working population are employed in professional or administrative positions, while 11.2% are in hands-on or service-based jobs. Also, 14.7% run their own businesses, 70.1% are employed by private companies, and 6.6% work in the public sector.

Workforce demographics

Working population
3,807
-0.3% year-over-year change
White collar
3,381
Blue collar
426
Value Percent YoY change
White collar 3,381 88.8% 1.3%
Blue collar 426 11.2% -11.4%
Employer type
Self employees
14.7%
Private companies
70.1%
Governmental workers
6.6%
Not for profit companies
8.6%
Value Percent YoY change
Self employees 559 14.7% -19.9%
Private companies 2,669 70.1% 1.9%
Governmental workers 253 6.6% -3.4%
Not for profit companies 326 8.6% 35.8%
Unemployment rate
6.7%
10.5% year-over-year change

Available workforce

The unemployment rate in Cos Cob stands at 6.7%, representing the share of the workforce currently without a job and actively looking for one.

For renters, the unemployment rate helps paint a picture of job security and financial stability in the area. Rates around 4% to 5% are considered typical. A lower-than-average rate might suggest strong job prospects and a thriving local economy, while a higher rate could hint at fewer opportunities—both useful to consider when planning a move.

Transportation in Cos Cob

How people get around in Cos Cob

Commuting methods vary: 56.5% of residents travel by personal vehicle and 2.9% prefer to walk, while the remaining share relies on public transit or on two wheelers to get from A to B.

Means of transportation
Value Percent YoY change
Car 2,115 56.5% -5.5%
Taxicab 16 0.4% 45.5%
Subway or elevated 37 1% N/A
Railroad 321 8.6% 7.0%
Walk 107 2.9% 46.6%
Understanding how locals get to work can help you plan your own routine. High car usage might mean you’ll need a vehicle, while strong public transit or walkability could save you the hassle. Commute times also play a big role in quality of life—shorter trips can give you more time for the things you enjoy.

What is the median and average household income in Cos Cob by zipcode?

Zipcode Population Number of households Median income Average income
06807 7,650 2,828 $192,115 $306,331

Find your place

Explore more communities

FAQs about Cos Cob demographics 

What is the total population of Cos Cob?

Cos Cob has a total population of 7,546 residents, according to the latest release from the U.S. Census Bureau: the 2019-2023 American Community Survey (ACS) 5-year estimates. This figure changed by +2.6% compared to a year ago.

What is the gender ratio in Cos Cob?

The gender ratio in Cos Cob is as follows:
  • 48.3% males (3,645 residents)
  • 51.7% females (3,901 residents)

What is the median age in Cos Cob?

The median age in Cos Cob is 39.6.

What is the age distribution of the population in Cos Cob?

The age distribution in Cos Cob is as follows:
  • Under 15: 21.3% (1,608 residents)
  • Ages 15-24: 13.2% (999 residents)
  • Ages 25-44: 23.8% (1,793 residents)
  • Ages 45-64: 26.2% (1,980 residents)
  • Over 65: 15.4% (1,166 residents)

What is the racial and ethnic makeup of Cos Cob?

The racial and ethnic makeup of Cos Cob is as follows:
  • White: 68.3% (5,157 residents)
  • Black or African American: 3.1% (237 residents)
  • American Indian and Alaska Native: 0.3% (21 residents)
  • Asian: 6.6% (494 residents)
  • Native Hawaiian and Other Pacific Islander: 0% (0 residents)
  • Two or More Races: 14.8% (1,114 residents)
  • Other: 6.9% (523 residents)

What percentage of the population in Cos Cob are U.S.-born citizens?

U.S.-born citizens represent 74.4% of the population in Cos Cob.

How many housing units are there in Cos Cob?

There are 2,836 housing units in Cos Cob, reflecting a +4.6% change compared to the previous year, according to the latest data from the U.S. Census Bureau.

How many households are in Cos Cob and what is the average household size?

Cos Cob has a total of 2,747 households, with an average of 3 people in each.

What is the median household income in Cos Cob?

Cos Cob has a median household income of $190,481, representing a +7.9% shift from the previous year, according to the U.S. Census Bureau.

What is the employment rate and job market overview for Cos Cob?

The employment rate is 93.3% in Cos Cob, with a workforce of 3,807 residents. Here’s a detailed breakdown of the local job market:

Job types:
  • White-collar workers: 88.8% (3,381 residents)
  • Blue-collar workers: 11.2% (426 residents)

Places of employment:
  • Self-employed: 14.7% (559 residents)
  • Private companies: 70.1% (2,669 residents)
  • Governmental workers: 6.6% (253 residents)
  • Not-for-profit companies: 8.6% (326 residents)

Data source & methodology

The demographic data on this page was sourced from the latest U.S. Census Bureau release—the 2019–2023 American Community Survey (ACS) 5-year estimates.

The information, issued annually, is compiled and published by the Point2Homes Research Team as soon as new data becomes available.

No representation, guarantee, or warranty is made concerning the accuracy or completeness of modified or aggregated information for particular areas.

Page last updated: September 2025