C
- (Simcoe County) Carthew Bay
- (Simcoe County) Cashtown Corners
- (Comtés unis de Prescott et Russell) Cassburn
- (Oxford County) Cassel
- (Renfrew County) Castile
- (Ottawa) Castle Heights
- (District Municipality of Muskoka) Castle Island
- (Peterborough County) Cavan
- (Lennox and Addington County) Caverlys Landing
- (Parry Sound District) Cecebe
- (Durham) Cedar Beach
- (Parry Sound District) Cedar Croft
- (Lanark County) Cedardale
- (Ottawa) Cedardale
- (Durham) Cedarhurst Beach
- (Frontenac County) Cedar Lake
- (Simcoe County) Cedarmont Beach
- (District Municipality of Muskoka) Cedar Nook
- (Durham) Cedar Shores
- (Peterborough County) Cedar Valley
- (District Municipality of Muskoka) Cedar Village
- (Simcoe County) Cedarville
- (Grey County) Cedarville
- (Middlesex County) Centralia
- (Ottawa) Central Park
- (Kenora District) Central Patricia
- (Peterborough County) Centre Dummer
- (Comtés unis de Prescott et Russell) Centrefield
- (Wellington County) Centre Inn
- (Ottawa) Centrepointe