- L'Hammock Island
- Lake View
- Lake View Terrace
- Lakeridge Heights
- Lakeside
- Lakeside
- Lakeside Woods
- Lakeville
- Lakewood
- Lamson Corner
- Lanesville
- Lattins Landing
- Laurel Beach
- Laurel Glen
- Laysville
- Lebanon
- Ledyard
- Leesville
- Leetes Island
- Lewis Island
- Liberty Hill
- Liberty Mobile Home Park
- Lime Rock
- Lisbon
- Little Captain Island
- Little City
- Little Danbury
- Little Haddam
- Little Hammock Island
- Little Ram