| Place Name | Darien |
| Place Type | Town |
| ZIP Code(s) | 06820 |
| County | Fairfield County |
| Area Code(s) | 203,475 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2021) | 21,485 |
| Majority Ethnicity | White 88.05% |
| Metro/Micro Stats Area | Bridgeport-Stamford-Norwalk, CT |
| US Congressional District(s) | Connecticut 4th |
| State House Districts | 141 |
| State Senate Districts | 25,27 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 88.05% |
| African American | 0.83% |
| Hispanic | 0.04% |
| Asian | 6.15% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 4.93% |