- South Monmouth
- South Vassalboro
- South Windsor
- Spears Corner
- Spruce Island
- Sturtevant Hill
- Summerhaven
- Southern Island
- Saddle Island
- Sand Island
- Sawpit Corner
- Scraggy Ledge
- Seal Island
- Seal Island
- Seavey Island
- Seavey Island
- Shag Ledge
- Shag Rock
- Shark Island
- Sheep Island
- Sheep Island
- Sheep Island
- Shermans Mill
- Simonton Corners
- Slins Island
- Smith Island
- South Big Garden Island
- South Cushing
- South Hope
- South Union