- Saint Albans
- Saint George
- Saint John
- Smithfield
- Somerville
- Southport
- Springfield
- Stow
- Scarborough
- Sidney
- Solon
- Sorrento
- Sumner
- South Bancroft
- South Limington
- South Sugarloaf Island
- Southern Island
- Sand Island
- Sabino
- Saddle Island
- Saddleback Island
- Sagamore Village
- Sail Rock
- Saint Clair Island
- Saint Croix Island
- Saint Croix Junction
- Saint David
- Saint Helena Island
- Sal Seal Island
- Salem