Population 8,277 · Census ACS 2020–24
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Population and households in Cos Cob
Household size in Cos Cob
| Period | Cos Cob | Bridgeport area | Connecticut | U.S. |
|---|---|---|---|---|
| 2006–10 | 2.66 | 2.71 | 2.57 | 2.68 |
| 2010–14 | 2.76 | 2.80 | 2.61 | 2.73 |
| 2015–19 | 2.79 | 2.76 | 2.57 | 2.71 |
| 2020–24 | 2.78 | 2.75 | 2.55 | 2.65 |
| Change | +0.12 | +0.04 | −0.02 | −0.03 |
The typical household in Cos Cob holds 2.78 people, slightly more than the U.S. average of 2.65. Since 2006–10, household size has climbed from 2.66, even as the national average fell. Households are largest in the southwest and smallest in the east.
Household size: the average number of people living in each occupied home. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25010).
Median age in Cos Cob
| Period | Cos Cob | Bridgeport area | Connecticut | U.S. |
|---|---|---|---|---|
| 2006–10 | 43.9 | 39.4 | 40.0 | 37.7 |
| 2010–14 | 42.3 | 40.3 | 41.0 | 38.6 |
| 2015–19 | 44.2 | 41.5 | 42.0 | 39.6 |
| 2020–24 | 39.9 | 41.6 | 42.1 | 40.1 |
| Change | −3.9 | +2.2 | +2.1 | +2.3 |
Half of the people in Cos Cob are younger than 39.9 and half are older, close to the national median of 40.1. The population here is younger than in the Bridgeport area as a whole, where the median age is 41.6. Since 2006–10, the median age has dropped from 43.9, even as the national median rose.
Median age: the age that splits residents into two equal halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B01002).
Single-parent households in Cos Cob
| Period | Cos Cob | Bridgeport area | Connecticut | U.S. |
|---|---|---|---|---|
| 2006–10 | 7.1% | 10.1% | 11.2% | 12.3% |
| 2010–14 | 4.4% | 10.8% | 11.6% | 12.3% |
| 2015–19 | 10.0% | 10.1% | 10.8% | 11.6% |
| 2020–24 | 10.2% | 10.3% | 11.4% | 11.6% |
| Change | +3.0 pts | +0.2 pts | +0.2 pts | −0.6 pts |
Single-parent households are a bit less common in Cos Cob than nationally: 10.2%, against 11.6%. The Bridgeport area as a whole looks much the same. The single-parent share is up 3.0 points from 2006–10, even as the national share fell.
Single-parent households: households where one adult with no spouse present lives with children under 18. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B11003).
Housing in Cos Cob
Renters in Cos Cob
| Period | Cos Cob | Bridgeport area | Connecticut | U.S. |
|---|---|---|---|---|
| 2006–10 | 21.6% | 29.3% | 30.8% | 33.3% |
| 2010–14 | 21.4% | 31.5% | 32.7% | 35.6% |
| 2015–19 | 27.8% | 32.9% | 33.9% | 36.0% |
| 2020–24 | 30.4% | 34.0% | 33.5% | 34.8% |
| Change | +8.8 pts | +4.6 pts | +2.7 pts | +1.5 pts |
Most households in Cos Cob own their homes; 30.4% rent, a little below the national share of 34.8%. Among owners, 28.6% have paid off their mortgages, well below the national share of 39.8%. Renting is most common in the east and least common in the north. The renter share has risen 8.8 points since 2006–10, a much bigger shift than nationally.
Renters: occupied homes that are rented rather than owned. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25003).
Vacant homes in Cos Cob
| Period | Cos Cob | Bridgeport area | Connecticut | U.S. |
|---|---|---|---|---|
| 2006–10 | 10.3% | 8.3% | 8.8% | 11.4% |
| 2010–14 | 8.5% | 8.8% | 9.5% | 11.4% |
| 2015–19 | 5.2% | 9.4% | 10.2% | 11.1% |
| 2020–24 | 5.4% | 7.0% | 7.9% | 9.6% |
| Change | −4.9 pts | −1.4 pts | −0.9 pts | −1.8 pts |
Only 5.4% of homes in Cos Cob are vacant, far below the national rate of 9.6%, which usually means strong demand for housing. Vacancy has fallen 4.9 points since 2006–10, in line with the national trend.
Vacant homes: homes with no one living in them, including vacation homes and homes for sale or rent. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25002).
Age of homes in Cos Cob
| Period | Cos Cob | Bridgeport area | Connecticut | U.S. |
|---|---|---|---|---|
| 2006–10 | 1958 | 1961 | 1963 | 1974 |
| 2010–14 | 1962 | 1962 | 1964 | 1975 |
| 2015–19 | 1960 | 1964 | 1964 | 1977 |
| 2020–24 | 1963 | 1967 | 1967 | 1980 |
| Change | +5 | +6 | +4 | +6 |
The housing in Cos Cob is old by national standards: the median home dates to 1963, against 1980 for the U.S., so buyers will find more older houses, some of them due for updates. The median year built has moved up from 1958 in 2006–10, a sign of steady new building. The newest homes are mostly in the northeast, the oldest in the west.
Age of homes: the year that splits the housing stock into older and newer halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25035).
Rent in Cos Cob
| Period | Cos Cob | Bridgeport area | Connecticut | U.S. |
|---|---|---|---|---|
| 2006–10 | $1,855 | $1,394 | $1,127 | $965 |
| 2010–14 | $1,940 | $1,488 | $1,218 | $1,040 |
| 2015–19 | $2,066 | $1,784 | $1,380 | $1,213 |
| 2020–24 | $3,093 | $2,167 | $1,702 | $1,571 |
| Change | +$1,237 | +$773 | +$575 | +$606 |
A typical rental in Cos Cob costs $3,093 a month with utilities, well above the national median of $1,571. Rents are up $1,237 a month from 2006–10, a 67% jump, faster than rents rose nationally. The typical renter here spends 35.1% of household income on rent, well over the 30% mark often used to define affordable rent, so many renters here are stretched. The priciest rents are in the south; the most affordable are in the northeast.
Rent: monthly rent plus the utilities renters pay themselves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25064).
Education in Cos Cob
Bachelor's degrees in Cos Cob
| Period | Cos Cob | Bridgeport area | Connecticut | U.S. |
|---|---|---|---|---|
| 2006–10 | 67.4% | 43.2% | 35.5% | 28.4% |
| 2010–14 | 70.9% | 45.5% | 37.0% | 29.6% |
| 2015–19 | 73.1% | 47.9% | 39.2% | 32.1% |
| 2020–24 | 74.8% | 50.4% | 42.3% | 35.6% |
| Change | +7.3 pts | +7.2 pts | +6.8 pts | +7.2 pts |
College graduates are unusually common in Cos Cob: 74.8% of adults 25 and older have a bachelor's degree or higher, against 35.6% nationally. Education tends to track local incomes and the kinds of jobs nearby. Since 2006–10, the share with a degree has risen 7.3 points, as it has nationally. Only nine of the 145 Connecticut cities with 5,000+ people have a higher share of college graduates.
Bachelor's degrees: adults 25 and older with a bachelor's degree or higher. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
High school graduates in Cos Cob
| Period | Cos Cob | Bridgeport area | Connecticut | U.S. |
|---|---|---|---|---|
| 2006–10 | 96.0% | 87.7% | 88.1% | 84.9% |
| 2010–14 | 96.1% | 88.8% | 89.2% | 86.1% |
| 2015–19 | 96.7% | 89.8% | 90.4% | 87.7% |
| 2020–24 | 96.0% | 89.7% | 91.2% | 89.3% |
| Change | +0.0 pts | +2.0 pts | +3.1 pts | +4.3 pts |
High school completion is high in Cos Cob: 96.0% of adults 25 and older have a diploma or equivalent, well above the national rate of 89.3%. The share with a diploma is little changed from 2006–10, while the national rate rose.
High school graduates: adults 25 and older with a high school diploma, GED or more. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
Jobs in Cos Cob
| Period | Cos Cob | Bridgeport area | Connecticut | U.S. |
|---|---|---|---|---|
| 2006–10 | 5.2% | 7.6% | 7.8% | 8.1% |
| 2010–14 | 6.9% | 9.6% | 9.7% | 9.4% |
| 2015–19 | 4.7% | 6.5% | 6.2% | 5.6% |
| 2020–24 | 5.3% | 5.8% | 5.6% | 5.4% |
| Change | +0.1 pts | −1.9 pts | −2.1 pts | −2.7 pts |
At 5.3%, unemployment in Cos Cob is close to the national rate of 5.4%. Because the Census pools five years of responses (2020–24), these rates smooth over short swings and lag the current job market.
Unemployment: people looking for work as a share of everyone working or looking. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B23025).
Cos Cob compared with nearby cities
| City | Household size | Median age | Single parents | Renters | Vacant homes | Median year built | Median rent | Bachelor's degree | High school diploma | Unemployment |
|---|---|---|---|---|---|---|---|---|---|---|
| Cos Cob | 2.78 | 39.9 | 10.2% | 30.4% | 5.4% | 1963 | $3,093 | 74.8% | 96.0% | 5.3% |
| Riverside | 3.09 | 41.0 | 6.5% | 19.4% | 4.2% | 1963 | $2,794 | 78.6% | 97.8% | 5.3% |
| Old Greenwich | 2.98 | 40.7 | 7.3% | 13.9% | 6.8% | 1967 | $3,429 | 83.9% | 98.6% | 4.5% |
| Greenwich | 2.72 | 45.2 | 9.4% | 34.8% | 13.3% | 1962 | $2,809 | 68.8% | 94.9% | 6.3% |
| Stamford | 2.60 | 39.3 | 10.3% | 51.2% | 6.8% | 1974 | $2,458 | 50.9% | 88.7% | 4.9% |
| Port Chester | 2.92 | 40.6 | 16.4% | 53.7% | 4.2% | 1956 | $2,121 | 35.4% | 77.8% | 5.5% |
| Rye Brook | 2.85 | 43.3 | 10.2% | 14.4% | 4.4% | 1968 | $2,440 | 79.2% | 97.0% | 6.4% |
| Darien | 3.10 | 37.9 | 7.5% | 17.6% | 7.4% | 1959 | $2,988 | 85.6% | 98.3% | 5.1% |
| Purchase | 3.21 | 31.7 | 5.1% | 24.3% | 9.6% | 1986 | $2,934 | 65.3% | 98.6% | 9.1% |
| Rye | 2.95 | 44.2 | 8.3% | 29.5% | 9.3% | 1958 | $2,740 | 81.1% | 96.5% | 5.7% |
| Harrison | 2.96 | 40.4 | 9.5% | 41.4% | 7.5% | 1962 | $2,768 | 58.8% | 93.2% | 4.5% |
All figures 2020–24.
Cities with similar populations: Cohasset, MA · Solvang, CA · Smithville, TX · Smithsburg, MD · Smiths, AL · Creston, IA · Cowpens, SC · Country Club Estates, GA · Colonial Beach, VA · Somerville, AL
About these numbers
Every figure on this page is a BestNeighborhood calculation from the Census Bureau's American Community Survey (ACS), built up from the Census block groups that make up Cos Cob. Each ACS 5-year release pools five years of responses; this page shows the last 15 releases, 2006–10 through 2020–24. Neighboring releases share four of their five years, so they move gradually and small changes between them are within the survey's margin of error; in small places the lines can jump from one release to the next for the same reason. The maps show the same measures for each neighborhood, ranked against the whole country.
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