| Place Name | Cos Cob |
| Place Type | Census Designated Place |
| ZIP Code(s) | 06807 |
| County | Fairfield County |
| Area Code(s) | 203,475 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2022) | 6,605 |
| Population Growth Rate (2010-19) | 1.52% |
| Majority Ethnicity | White 82.65% |
| Metro/Micro Stats Area | Bridgeport-Stamford-Norwalk, CT |
| US Congressional District(s) | Connecticut 4th |
| State House Districts | 150,151 |
| State Senate Districts | 36 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 82.65% |
| African American | 0.29% |
| Hispanic | 0.16% |
| Asian | 5.5% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 11.4% |