- Salisbury Center
- Shelter Island
- Smith Corners
- South Columbia
- Spinnerville
- Starkville
- Stewart Corners
- Stillwater
- Stratford
- Sunset View Mobile Home Park
- Saint Elmo Island
- Saint Helena Island
- Saint Lawrence
- Saint Lawrence Park
- Sand Island
- Sandy Acres Mobile Home Park
- Sanfords Four Corners
- Sargent Island
- Saxe Corner
- Schooner Island
- Seven Isles
- Sewalls Island
- Shady Bay Mobile Home Park
- Ski Island
- Smithville
- Smugglers Island
- Snake Oil Island
- Squaw Island
- Steamboat Island
- Sterlingville