- Sagamore
- Salem
- Salisbury
- Sandisfield
- Sandwich
- Saugus
- Savoy
- Scituate
- Seabrook
- Seconsett Island
- Seekonk
- Sharon
- Sheffield
- Shelburne
- Shelburne Falls
- Sherborn
- Shirley
- Shrewsbury
- Shutesbury
- Siasconset
- Ski Butternut
- Ski Ward
- Smith Mills
- Somerset
- Somerville
- 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
- Springfield
- Sterling
- Stockbridge
- Stoneham
- Stoughton
- Stow
- Sturbridge
- Sudbury
- Sunderland
- Sutton
- Swampscott
- Swansea
