C
- (Renfrew County) Cobden
- (Kawartha Lakes) Coboconk
- (Oxford County) Cody's Corners
- (District Municipality of Muskoka) Cognashene
- (Comtés unis de Prescott et Russell) Coins Gratton
- (Dufferin County) Colbeck
- (Northumberland County) Colborne
- (Middlesex County) Coldstream
- (Simcoe County) Coldwater
- (Lennox and Addington County) Colebrook
- (Lanark County) Coleman's Shore
- (Simcoe County) Colgan
- (Lambton County) Colinville
- (Simcoe County) Colwell
- (Renfrew County) Combermere
- (Parry Sound District) Commanda
- (Simcoe County) Concord Point
- (Regional Municipality of Waterloo) Conestogo
- (Ottawa) Confederation Heights
- (Renfrew County) Connaught
- (Peterborough County) Connaught Shore
- (Simcoe County) Connor
- (Dufferin County) Conover
- (Perth County) Conroy
- (Renfrew County) Constant Creek
- (Ottawa) Convent Glen
- (Lanark County) Cooke's Shore
- (Hastings County) Cooper
- (Simcoe County) Coopers Falls
- (Peterborough County) Cooper's Trailer Park