S
- Smooth Rock Falls
- St. Marys
- Sundridge
- Saugeen Shores
- South Bruce Peninsula
- (Bruce County) Southampton
- (Kenora District) Summer Beaver
- (Comtés unis de Prescott et Russell) St. Isidore
- (District Municipality of Muskoka) South Portage
- (Middlesex County) Sable
- (United Counties of Leeds and Grenville) Sabourins Crossing
- (Durham) Saginaw
- (Algoma) Sailors Encampment
- (Durham) Saintfield
- (Durham) Salem
- (Northumberland County) Salem
- (Bruce County) Salem
- (Bruce County) Salem
- (Oxford County) Salford
- (Middlesex County) Salmonville
- (Huron County) Saltford
- (United Counties of Leeds and Grenville) Sand Bay Corner
- (Durham) Sandford
- (Simcoe County) Sandy Beach
- (Renfrew County) Sandy Beach
- (Ottawa) Sandy Hill
- (Comtés unis de Prescott et Russell) Sandy Hill
- (Parry Sound District) Sans Souci
- (Huron County) Saratoga
- (Grey County) Sarawak