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Países do mundo
O
- (Dufferin County) Orton
- (Parry Sound District) Orrville
- (Regional Municipality of Waterloo) Orr's Lake
- (Simcoe County) Orr Lake
- (Simcoe County) Oro Station
- (Simcoe County) Oro
- (Hastings County) Ormsby
- (Elgin County) Ormond Beach
- (Outaouais) Orlo
- (Simcoe County) Orkney Beach
- (Oxford County) Oriel
- (Estrie) Orford Lake
- (Regional Municipality of Niagara) O'Reilly's Bridge
- (Grey County) Orchardville
- (Elgin County) Orchard Beach
- (Parry Sound District) Oranmore
- (Cochrane District) Opasatika
- (Outaouais) Onslow Corners
- (Frontenac County) Ompah
- (Estrie) Omerville
- (Wellington County) Olivet
- (Squamish-Lillooet Regional District) Oliver's Landing
- (County of Camrose No. 22) Ohaton
- (Renfrew County) O'Grady Settlement
- (Laurentides) Ogdensburg
- (Estrie) Ogden
- (Lennox and Addington County) Odessa
- (Frontenac County) Oconto
- (Thunder Bay District) O'Connor
- (Metro Vancouver Regional District) Ocean Park