Cos Cob, Connecticut Demographics & Population 2026
During the 2020–2024 ACS period, Cos Cob, Connecticut had a total population of 7,546, the 46th largest community in Connecticut, with a median household income of $190,481, which is 99% higher than the state average. The poverty rate is 5.6%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Key Takeaways
- Household income is 99% above the state average — one of the wealthiest communities in Connecticut.
Cos Cob Quick Facts
How Cos Cob Changed
Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.
| Metric | 2019–2023 | 2020–2024 | Change |
|---|---|---|---|
| Population | 7,354 | 7,546 | +2.6% |
| Median household income | $176,602 | $190,481 | +7.9% |
| Median home value | $1,149,500 | $1,210,400 | +5.3% |
How Cos Cob Compares
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
A diverse community with significant representation from multiple racial and ethnic groups.
State average: 57 | National average: 61
Education
Educational Attainment (Adults 25+)
Cos Cob Rankings in Connecticut
Explore Connecticut Rankings
Cities Similar to Cos Cob
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Staples | 7,340 | $192,656 | $1,165,500 | 73.0% | 4.4% |
| Long Hill (Greater Bridgeport County) | 8,681 | $178,456 | $487,800 | 56.1% | 3.8% |
| Ridgefield | 6,970 | $148,279 | $843,600 | 68.9% | 2.5% |
| Old Greenwich | 6,936 | $250,000+ | $1,844,700 | 85.4% | 3.6% |
| New Canaan | 6,896 | $146,700 | $1,099,400 | 74.7% | 5.1% |
Population Overview
Cos Cob is a small city located in Connecticut. The total population is 7,546. It ranks as the 46th most populous out of 214 Census-designated places in Connecticut.
Age Demographics
The median age in Cos Cob is 39.6 years. This is 4% lower than the state median of 41.1 years. With 29.3% of the population under 18, Cos Cob has a notably young demographic profile, suggesting a family-oriented community.
Economy, Income & Housing
The median household income in Cos Cob is $190,481. This is 99% higher than the state median of $95,781. It is also 136% higher than the national median of $80,734. The poverty rate stands at 5.6%. This is 44% lower than the state poverty rate of 10.0%. The unemployment rate is 6.7%. This is 20% higher than the state rate of 5.6%. The median home value is $1,210,400. Housing costs are 230% higher than the state median of $366,900. The home-value-to-income ratio of 6.4x suggests that housing affordability is a significant concern for many residents. 66.7% of occupied housing units are owner-occupied.
Race & Ethnicity
The largest racial or ethnic group in Cos Cob is White (non-Hispanic), making up 64.4% of the population. Hispanic or Latino residents account for 15.0%. The Black or African American population (3.1%) is well below the state average of 9.8%.
Education
70.2% of residents aged 25 and older hold a bachelor's degree or higher. This is 65% higher than the state rate of 42.5%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 95.3%. Notably, 36.7% of adults hold a graduate or professional degree, indicating a highly educated workforce.
Data Sources & Methodology
All demographic data for Cos Cob, Connecticut is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against Connecticut state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 214 Census-designated places in Connecticut. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.
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Frequently Asked Questions
What is the population of Cos Cob, Connecticut?
Cos Cob, Connecticut has a population of 7,546 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in Cos Cob, CT?
The median household income in Cos Cob is $190,481, which is 136% higher than the national median of $80,734.
What is the poverty rate in Cos Cob, CT?
The poverty rate in Cos Cob is 5.6%. This means approximately 421 residents live below the federal poverty line.
What is the racial makeup of Cos Cob, Connecticut?
Cos Cob's population is 64.4% White, 3.1% Black, 15.0% Hispanic/Latino, and 6.6% Asian.
What is the median home value in Cos Cob, CT?
The median home value in Cos Cob is $1,210,400. The home-value-to-income ratio is 6.4x.
How educated is Cos Cob, Connecticut?
70.2% of adults (25+) in Cos Cob hold a bachelor's degree or higher, and 36.7% hold a graduate or professional degree.