- Students Island
- Sweden
- Sandy Beach
- Saponac
- Shin Pond
- Siberia
- Silvers Mills
- Six Mile Falls
- Snow Corner
- Snow Island
- Socks Island
- Socs Island
- South Brewer
- South Corinth
- South Exeter
- South Levant
- South Lincoln
- South Newburgh
- South Orrington
- South Springfield
- South Woodville
- Spectacle Island
- Spooners Mill
- Spragues Mill
- Spring Island
- Squirrel Island
- State Island
- Stillwater
- Stillwater Avenue
- Storers Corner