- Leyford Island
- Libby Island
- Lily Bay
- Little Porus Island
- Lamb Island
- Lee Island
- Lines Island
- Little Knubble
- Little Lines Island
- Little Swan
- Little Wood Island
- La Croix Depot
- Lakewood
- Larone
- Ledge Island (historical)
- Lexington
- Libbey Island
- Lily Island
- Loon Island
- Lower Mill
- Lyford Corner
- Lime Island
- Lincolnville Center
- Little Bermuda
- Little Island
- Long Island
- Lakeman Island
- Lamb Place
- Larrabee
- Leighton Rock