- Upper Birch Island
- Upper Coombs Island
- Upper Goose Island
- Upper Negro Island
- Upper Shirley Corner
- Upper Sister Island
- Upper Torrey Island
- Uncle Zeke Island
- Union
- Union Falls
- Unionville
- Unity
- Upper Abbot
- Upper Dam
- Upper Drew
- Upper Flag Island
- Upper Frenchville
- Upper Gloucester
- Upper Green Islands
- Upper Landing
- Upper Mark Island
- Upton