C
- (Northumberland County) Centreton
- (Hastings County) Centreview
- (Lennox and Addington County) Centreville
- (Oxford County) Centreville
- (Bruce County) Centreville
- (Grey County) Ceylon
- (United Counties of Leeds and Grenville) Chaffeys Locks
- (Timiskaming District) Chamberlain
- (Regional Municipality of Niagara) Chambers Corners
- (Ottawa) Champlain Park
- (Peterborough County) Chandos Lake
- (United Counties of Leeds and Grenville) Chantry
- (Hastings County) Chapman
- (Parry Sound District) Chapman's Landing
- (Lambton County) Charlemont
- (United Counties of Leeds and Grenville) Charleville
- (Timiskaming District) Charlton
- (Peterborough County) Chase Corners
- (Grey County) Chatsworth
- (Haliburton County) Cheddar
- (United Counties of Leeds and Grenville) Cheeseborough
- (Timiskaming District) Cheminis
- (Peterborough County) Chemong Heights
- (Peterborough County) Chemong Park
- (Renfrew County) Chenaux
- (Middlesex County) Cherry Grove
- (Kawartha Lakes) Cherry Island
- (Oxford County) Chesterfield
- (Parry Sound District) Chetwynd
- (Parry Sound District) Chikopi