- South Casco
- South Freeport
- South Gorham
- South Gray
- South Harpswell
- South Naples
- Sow and Pigs
- Spider Island
- Spider Island
- Stanwood Park
- Stave Island
- Stepping Stones
- Stockman Island
- Stroudwater
- Stuarts Corner
- Sturdivant Island
- Suckerville
- Sunset Landing
- Sunset Park
- Skinner
- Soule Mill
- South Bog Islands
- South Rangeley
- South Strong
- Stones Corner
- Sand Island
- Saddleback Island
- Saint Helena Island
- Sally Island
- Sally Islands