4 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Orange | South Central CT Planning Region | 14,462 |
| Oxford | Naugatuck Valley Planning Region | 13,354 |
| Old Saybrook | Lower CT River Valley Planning Region | 10,756 |
| Old Lyme | Lower CT River Valley Planning Region | 7,733 |