S
- (Simcoe County) Stayner
- (Durham) St. Christopher
- (Ottawa) St. Claire Gardens
- (Comtés unis de Prescott et Russell) St. Davids
- (Comtés unis de Prescott et Russell) Ste-Anne-de-Prescott
- (Rainy River District) Steep Rock Lake
- (Lennox and Addington County) Stella
- (Ottawa) Stewart Farm
- (Peterborough County) Stewart Hall
- (Peterborough County) Stewart Heights
- (Renfrew County) Stewartville
- (Huron County) St. Helens
- (Parry Sound District) Stirling Falls
- (Wellington County) Stirton
- (Ottawa) Stittsville
- (Middlesex County) St. Ives
- (Hastings County) Stoco
- (Hastings County) St. Ola
- (Renfrew County) Stonecliffe
- (United Counties of Leeds and Grenville) Stones Corners
- (Comtés unis de Prescott et Russell) St-Onge
- (Peterborough County) Stonyridge
- (Wellington County) Stonywood
- (Parry Sound District) Storie
- (Lennox and Addington County) Storms Corners
- (Perth County) St. Pauls Station
- (York) Strange
- (Oxford County) Strathallan
- (Grey County) Strathavon
- (Middlesex County) Strathburn