4 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Orange | South Central CT Planning Region | 14,474 |
| Oxford | Naugatuck Valley Planning Region | 13,483 |
| Old Saybrook | Lower CT River Valley Planning Region | 10,575 |
| Old Lyme | Lower CT River Valley Planning Region | 7,714 |