- Sibleys Corner
- Silver Beach
- Silver Hill
- Silver Lake
- Silver Lake
- Silver Shell Beach
- Sippewisset
- Sipson Island
- Sissons Corner
- Sixteen Acres
- Ski Ward
- Skiffs Island (historical)
- Sky Farm
- Skyland
- Slades Corner
- Slades Ferry
- Slate Island
- Slates Island
- Slocums Corner
- Slocums Ledge
- Smalltown
- Smead Island
- Smith Highlands
- Smith Mills
- Smiths Ferry
- Smithville
- Smooth Hummocks
- Snake Island
- Snell Corner
- Snell Island