| Place Name | Old Mystic |
| Place Type | Census Designated Place |
| ZIP Code(s) | 06339 06355 |
| County | New London County |
| Area Code(s) | 860,959 |
| Timezone | Eastern Daylight Time (EDT) |
| Population (2022) | 3,570 |
| Population Growth Rate (2010-19) | -1.72% |
| Majority Ethnicity | White 82.4% |
| Metro/Micro Stats Area | Norwich-New London, CT |
| US Congressional District(s) | Connecticut 2nd |
| State House Districts | 40 |
| State Senate Districts | 18 |
| Race/Ethnicy | Percentage of Population (2021) |
|---|---|
| White | 82.4% |
| African American | 4.93% |
| Hispanic | 0% |
| Asian | 6.38% |
| Native American | 0% |
| Hawaiin/Pacific Islander | 6.29% |