Tool
Compare places
Put up to four U.S. cities, towns or census-designated places side by side on 29 figures: 22 measures from the ACS 2020-2024 5-year estimates, each with its margin, and their 2025 population estimate, growth, density, new homes and housing costs against income. A filled square marks a figure that differs from the first place by more than both margins of error allow; without it, the survey cannot tell the two apart.
How do Cos Cob, CT compare?
| Figure | Cos Cob, CT |
|---|---|
| Residents, July 2025 (estimate) | no yearly estimate (census-designated place) |
| Change since April 2020 | – |
| Residents counted in the 2020 Census | 6,873 |
| Residents per square mile (2020) | 3,194 |
| Homes permitted in 2025 per 1,000 residents | – |
| Median home value ÷ median household income | 6.4 years of income |
| A year of median rent ÷ median income of all households (renters usually earn less) | 19.3% |
| Measure | Cos Cob, CT |
|---|---|
| Total population | 7,546±960 |
| Median age | 39.6±2.6 |
| Hispanic or Latino (any race) | 15.0%±5.0 pts |
| White alone, not Hispanic | 64.4%±7.0 pts |
| Black or African American alone, not Hispanic | 3.1%±3.2 pts |
| Asian alone, not Hispanic | 6.5%±3.6 pts |
| Born outside the United States | 25.2%±6.2 pts |
| Bachelor's degree or higher (age 25+) | 70.2%±7.6 pts |
| Median household income | $190,481±$30,784 |
| Per capita income | $104,168±$14,396 |
| People below the poverty line | 5.6%±3.8 pts |
| Unemployment rate | 6.7%±3.0 pts |
| Median home value (owner-occupied) | $1,210,400±$136,068 |
| Median gross rent | $3,067±$701 |
| Renters paying 35% or more of income on rent | 54.0%±14.5 pts |
| Owner-occupied homes | 66.7%±7.9 pts |
| Built 2020 or later | 0.0%±1.5 pts |
| Worked from home | 30.0%±6.4 pts |
| Drove alone to work | 52.0%±6.7 pts |
| Public transportation | 9.6%±3.8 pts |
| Mean travel time to work | 28.9 min±3.1 |
| No health insurance coverage | 5.3%±3.1 pts |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census Bureau population estimates, Vintage 2025; 2020 Census; Building Permits Survey 2025 · Check it at data.census.gov