- Sagamore
- Salisbury
- Sandisfield
- Saugus
- Savoy
- Scituate
- Seabrook
- Seconsett Island
- Seekonk
- Sheffield
- Shelburne
- Shelburne Falls
- Sherborn
- Shutesbury
- Siasconset
- Ski Butternut
- Ski Ward
- Smith Mills
- South Amherst
- South Ashburnham
- South Boston
- South Deerfield
- South Dennis
- South Duxbury
- South Hadley
- South Lancaster
- South Peabody
- South Yarmouth
- Southampton
- Southborough
- Southbridge
- Southwick
- Spencer
- Stockbridge
- Stoughton
- Sturbridge
- Sudbury
- Sunderland
- Sutton
- Swampscott
- Swansea