States · Connecticut · Fairfield County

Cos Cob, Connecticut.

A community in Fairfield County, with no city government of its own. Zillow publishes no home prices for it: see Fairfield County’s.

Living in Cos Cob, Connecticut

Cos Cob, in , had 6,873 people in the 2020 census. Half its households earn more than $190,481 a year and half less; 6% of its people live below the poverty line. 67% of its homes are lived in by their owners and 33% are rented. The most residents work in finance and property, then professional services.

People 6,873 in the 2020 census; median age 39.6
Household income $190,481 the median, give or take $30,784
Homes 67% lived in by their owners; 33% rented
  • 2,747households
  • 70%of adults have a degree
  • 6%below the poverty line
  • 29 mintypical commute
  • 30%work from home

What residents work in

  • Banks, insurance and property21%
  • Professional and business services19%
  • Schools, hospitals and social care18%
  • Building trades9%
  • Media and telecoms8%
  • Other services7%

Employed residents by industry, from the Census survey.

Weather through the year

Average daily high and low for each month: coldest in January, 38° and 22°; warmest in July, 85° and 64° 20° 40° 60° 80° J 38° 22° F M A M J J 85° 64° A S O N D
Average daily high and low for each month: coldest in January, 38° and 22°; warmest in July, 85° and 64° 20° 40° 60° 80° J 38° 22° F M A M J J 85° 64° A S O N D

Coldest in January, with highs near 38° and lows near 22°; warmest in July, with highs near 85° and lows near 64°. About 34 inches of snow and 52 inches of rain and melted snow a year.

Average daily high and low, 1991–2020, at the Stamford North weather station, 6 miles away (NOAA).

Natural hazards

  1. Inland floodingRelatively high
  2. Strong windRelatively high
  3. HurricanesRelatively high
  4. Ice stormsRelatively high
  5. Winter weatherRelatively high
  6. Coastal floodingRelatively high

FEMA’s National Risk Index (December 2025) rates the risk each natural hazard poses to the people, buildings and farms across its county, against the rest of the country; all of them together, relatively high. It is meant for planning, not a substitute for a local risk assessment or a flood map: FEMA’s index.

From the U.S. Census Bureau’s 2020 census and its American Community Survey (2020–2024 five-year estimates), and the Bureau of Labor Statistics. A survey, so each figure has a margin of error, and figures it is not sure of are left out. More on .