- Shiloh
- Shiloh
- Shirley
- Shirleys Bay
- Shouldice
- Showers Corners
- Shrigley
- Siberia
- Signet
- Siloam
- Silver Lake
- Silverdale
- Simcoe Island
- Simcoe Lodge
- Simpson Corners
- Sinclair Shore
- Sine
- Sioux Lookout
- Sioux Lookout
- Sioux Narrows
- Skerryvore
- Skyline
- Slabtown
- Slade
- Slate Falls
- Slate River Valley
- Smith's Landing
- Smithdale
- Smiths Falls
- Smithville