- Sixty Islands
- Skyview Terrace
- Slab City
- Slabtown
- Slades Corners
- Slateford
- Slinger
- Slingshot Island
- Slovan
- Small Fry Island
- Small Island
- Smith Landing
- Snake Island
- Snake Island
- Snake Island
- Snake Tongue Island
- Snell
- Snells
- Sniderville
- Snipe Island
- Snipe Island
- Snows Corner
- Sobieski
- Sobieski Corners
- Soft Shell Island
- Soldiers Grove
- Solon Springs
- Somerfield Island (historical)
- Somers
- Somerset