C
- (Ottawa) Copeland Park
- (Elgin County) Copenhagen
- (Renfrew County) Copp
- (Parry Sound District) Copperhead
- (Grey County) Copperkettle
- (Durham) Coppin's Corners
- (Nipissing District) Corbeil
- (Middlesex County) Corbett
- (Dufferin County) Corbetton
- (Peterborough County) Cordova Mines
- (Elgin County) Corinth
- (Ottawa) Corkery
- (Oxford County) Cornell
- (Lambton County) Coronation Park
- (Wellington County) Corwhin
- (Hastings County) Cosy Cove
- (Renfrew County) Cotieville
- (Renfrew County) Cotnam Island
- (Peterborough County) Cottesloe
- (Simcoe County) Coulson
- (Simcoe County) Coulson's Hill
- (Ottawa) Country Place
- (Durham) Courtice
- (Ottawa) Courtland Park
- (Lambton County) Courtright
- (Timiskaming District) Couttsville
- (Simcoe County) Cove Beach
- (Frontenac County) Coxvale
- (Rainy River District) Cozy Corners
- (Ottawa) Craig Henry