C
- (Hastings County) Childs Mines
- (Regional Municipality of Niagara) Chippawa
- (Lennox and Addington County) Chippewa
- (Hastings County) Chisholm's Mills
- (Nipissing District) Chiswick
- (Parry Sound District) Christian Valley
- (Lanark County) Christie Lake
- (Middlesex County) Christina
- (Elgin County) Churchville
- (Middlesex County) Clandeboye
- (Wellington County) Clare
- (Frontenac County) Clarendon Station
- (Peterborough County) Clarina
- (Durham) Clarke
- (Bruce County) Clarke's Corners
- (Bruce County) Clarks Church
- (Renfrew County) Clay Bank
- (Renfrew County) Clay Valley
- (Parry Sound District) Clear Lake
- (York) Clearview Heights
- (Simcoe County) Clearwater Beach
- (Huron County) Clinton
- (Renfrew County) Clontarf
- (Algoma) Cloudslee
- (Bruce County) Clover Valley
- (Manitoulin District) Clover Valley
- (Frontenac County) Cloyne
- (Regional Municipality of Waterloo) Clyde
- (Lanark County) Clydesville
- (Middlesex County) Cobble Hill