S
- (Middlesex County) Springbank
- (Hastings County) Spring Brook
- (Middlesex County) Springfield
- (Elgin County) Springfield
- (Oxford County) Springford
- (Ottawa) Spring Hill
- (Grey County) Springmount
- (Renfrew County) Springtown
- (Peterborough County) Springville
- (Dufferin County) Springwater Lakes
- (Parry Sound District) Sprucedale
- (Wellington County) Spruce Green
- (Renfrew County) Spruce Hedge
- (Bruce County) Spry
- (Grey County) Squire
- (Manitoulin District) Squirrel Town
- (Perth County) Staffa
- (Regional Municipality of Waterloo) St. Agatha
- (Thunder Bay District) Stanley
- (Ottawa) Stanley Corners
- (Parry Sound District) Stanley House
- (Lanark County) Stanleyville
- (Regional Municipality of Niagara) St. Anns
- (Dufferin County) Stanton
- (Ottawa) Stapledon
- (Frontenac County) Star Corners
- (Comtés unis de Prescott et Russell) Stardale
- (Durham) Starkville
- (Parry Sound District) Starrat
- (Huron County) St. Augustine