- L'Hammock Island
- Lakeside Woods
- Lattins Landing
- Little Captain Island
- Little Danbury
- Little Hammock Island
- Little Ram
- Little Tavern Island
- Lonetown
- Long Hill
- Long Island
- Long Ridge
- Lordship
- Lamson Corner
- Liberty Mobile Home Park
- Lovely Street
- Lydallville
- Lakeside
- Lanesville
- Lime Rock
- Lower City
- Lower Merryall
- Lake View
- Lakeridge Heights
- Leesville
- Little City
- Little Haddam
- Lobster Rock
- Long Hill
- Long Rock