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• Ottawa
• Oakville
• Oshawa
• Orillia
• Orangeville
• Owen Sound
• (Capital Regional District) Oak Bay
• Okotoks
• Olds
• Oromocto
• (Montérégie) Otterburn Park
• (Regional District of Okanagan-Similkameen) Oliver
• Osoyoos
• (Ottawa) Osgoode
• Outlook
• (Montérégie) Ormstown
• (Kawartha Lakes) Omemee
• (Laurentides) Oka
• Oxford
• Oxbow
• (Strathcona Regional District) Owen Bay
• (Skeena-Queen Charlotte Regional District) Osland
• (Simcoe County) Old Fort
• (Simcoe County) Ogden's Beach
• (Skeena-Queen Charlotte Regional District) Oona River
• (Manitoulin District) Old Spring Bay
• (Regional District of Kitimat-Stikine) Old Remo
• (Victoria County) Ortonville
• (Victoria County) Odell
• (Victoria County) Oxbow