S
- (Frontenac County) Sydenham
- (Lambton County) Sykeston
- (Middlesex County) Sylvan
- (Simcoe County) Sylvan Glen Beach
- (Algoma) Sylvan Valley
- (Simcoe County) Schepeler
- (Hastings County) Shannonville
- (York) Schomberg
- (Regional Municipality of Niagara) Stevensville
- (Regional Municipality of Waterloo) St. Jacobs
- (Parry Sound District) South River
- (Hastings County) Stirling
- Sioux Lookout
- Shelburne
- (Lanark County) Smiths Falls
- Stratford
- St. Thomas
- (Algoma) Sault Ste. Marie
- (Lambton County) Sarnia
- (Regional Municipality of Niagara) St. Catharines