- Lower Mark Island
- Lambs Corner
- LeClair Island
- Libby Hill
- Litchfield Corners
- Litchfield Plains
- Locks Corner
- Long Island
- Loon Island
- Lovers Island
- Lake City
- Lane Island
- Large Green Island
- Lasell Island
- Lawry
- Lawrys Island
- Lawrys Ledge
- Leadbetter Island
- Little Brimstone Island
- Little Burnt Island
- Little Caldwell Islands
- Little Egg Rock
- Little Green Island
- Little Green Island
- Little Green Island
- Little Hen Island
- Little Hurricane Island
- Little Island
- Little Island
- Little Island