Cos Cob, CT Profile: Facts, Map & Data


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Cos Cob, Connecticut - Basic Facts

The Cos Cob Census Designated Place had a population of 7,156 as of July 1, 2017. Cos Cob ranks in the upper quartile for Population Density when compared to the other cities, towns and Census Designated Places (CDPs) in Connecticut. See peer rankings below.

The primary coordinate point for Cos Cob is located at latitude 41.0486 and longitude -73.5919 in Fairfield County. The formal boundaries for the Cos Cob Census Designated Place (see map below) encompass a land area of 2.08 sq. miles and a water area of 0.12 sq. miles. Fairfield County is in the Eastern time zone (GMT -5). The elevation is 52 feet.

The Cos Cob Census Designated Place (GNIS ID: 2631561) has a U1 Census Class Code which indicates a census designated place with an official federally recognized name. It also has a Functional Status Code of "S" which identifies a statistical entity.

The Cos Cob Census Designated Place is located within Town of Greenwich, a minor civil division (MCD) of Fairfield County.

Beneath the boundary map are tables with Cos Cob population, income and housing data, five-year growth projections and peer comparisons for key demographic data. The estimates are for July 1, 2017.

Alternate Unofficial Names for Cos Cob: Cos Cob Village, Lower Landing.

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Cos Cob Census Designated Place, CT Boundary Map

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Cos Cob, CT Data & Demographics (As of July 1, 2017)


Total Population 7,156
Daytime Population: Workers 2,230
Daytime Population: Residents 3,936
Total Daytime Population (TDP) 6,166
Ratio TDP/Total Population1 0.86
Population in Households 7,128
Population in Familes 6,150
Population in Group Qrtrs 28
Population Density2 3,447
Diversity Index3 44


Median Household Income $146,639
Average Household Income $202,309
Per Capita Income $75,291


Total Housing Units 2,778 (100%)
Owner Occupied HU 1,754 (63.1%)
Renter Occupied HU 894 (32.2%)
Vacant Housing Units 130 ( 4.7%)
Median Home Value $1,000,001
Average Home Value $976,153


Total Households 2,648
Average Household Size 2.69
Family Households 1,907
Average Family Size 3
  1. If the ratio of the TDP to Total Population is greater than 1, the location gains population during the day when commuting workers are present. If the ratio is less than 1, the location is more of a bedroom community where people commute to another place for work.
  2. Population Density = Total Population per square mile.
  3. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different race or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.


2010-2017 2017-2022
Population 0.77% 0.72%
Households 0.57% 0.62%
Families 0.48% 0.6%
Median Household Income   1.21%
Per Capita Income   1.88%

Cos Cob, CT - Peer Comparisons by Rank and Percentile

The table below compares Cos Cob to the other 142 incorporated cities, towns and CDPs in Connecticut by rank and percentile using July 1, 2017 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 50 65th
Population Density # 20 87th
Diversity Index # 41 72nd
Median Household Income # 6 96th
Per Capita Income # 9 94th

Additional comparisons and rankings can be made with a VERY EASY TO USE Connecticut Census Data Comparison Tool.

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