StatisticCos CobConnecticutNational
Population density (sq mi)3,14773691
Median age43.440.637.7
Male/Female ratio1.0:11.0:11.0:1
Married (15yrs & older)63%54%55%
Families w/ Kids under 1848%43%43%
Speak English71%78%79%
Speak Spanish10%12%13%

Key findings

  • The population density in Cos Cob is 328% higher than Connecticut
  • The median age in Cos Cob is 7% higher than Connecticut
  • In Cos Cob 82.60% of the population is White
  • In Cos Cob 1.38% of the population is Black
  • In Cos Cob 11.22% of the population is Asian

Compare Cos Cob, CT Demographics


      Cos Cob population breakdown by race

      RaceCos CobConnecticutNational
      American Indian0.14%0.26%0.82%
      Native Hawaiian0.00%0.03%0.18%
      Mixed race2.97%2.98%3.06%
      Other race1.70%4.95%4.75%
      In Cos Cob, 9.8% of people are of Hispanic or Latino origin.
      Please note: Hispanics may be of any race, so also are included in any/all of the applicable race categories above.

      Household income distribution

      Place of birth by citizenship

      Cos Cob age breakdown

      Marital status

      Age of children in married couples

      Source: The Cos Cob, CT demographics data displayed above is derived from the 2016 United States Census Bureau American Community Survey (ACS).