Cos Cob, CT Profile: Facts & Data


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Cos Cob, Connecticut - Basic Facts

The Cos Cob Census Designated Place had a population of 6,948 as of July 1, 2020. 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 41.0334 and longitude -73.5996 in Fairfield County. The formal boundaries for the Cos Cob Census Designated Place 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.

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


Cos Cob, CT Data & Demographics (As of July 1, 2020)


Total Population 6,948 (100%)
Population in Households 6,920 (99.6%)
Population in Families 5,979 (86.1%)
Population in Group Quarters1 28 ( 0.4%)
Population Density 3,346
Diversity Index2 46


Median Household Income $156,060
Average Household Income $217,505
% of Income for Mortgage4 28%
Per Capita Income $81,422
Wealth Index5 290


Total HU (Housing Units) 2,768 (100%)
Owner Occupied HU 1,707 (61.7%)
Renter Occupied HU 885 (32.0%)
Vacant Housing Units 176 ( 6.4%)
Median Home Value $1,059,935
Average Home Value $1,172,818
Housing Affordability Index3 87


Total Households 2,592
Average Household Size 2.67
Family Households 1,866
Average Family Size 3
  1. Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
  2. 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 races 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.
  3. The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
  4. The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
  5. The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.


2010-2020 2020-2025
Population 0.25% 0.2%
Households 0.19% 0.15%
Families 0.13% 0.17%
Median Household Income   1.22%
Per Capita Income   1.49%
Owner Occupied HU   0.57%


Cos Cob, CT - Peer Comparisons by Rank and Percentile

The table below compares Cos Cob to the other 143 incorporated cities, towns and CDPs in Connecticut by rank and percentile using July 1, 2020 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 # 51 65th
Population Density # 21 86th
Median Household Income # 6 97th
Housing Affordability Index # 16 11th
Per Capita Income # 7 96th
Diversity Index # 44 71st

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

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