Canadá

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• (Northumberland County) O'Donnells
• (Northumberland County) Old Dans Landing
• (Carleton County) Oakland
• (Carleton County) Orchards Corner
• (Carleton County) Oakville
• (Simcoe County) Oro Beach
• (Ottawa) Orléans
• (Durham) Orono
• (Regional District of Central Okanagan) Oyama
• (United Counties of Leeds and Grenville) Oxford Station
• (Metro Vancouver Regional District) Oxford Heights
• (Oxford County) Oxford Centre
• (Peterborough County) Owenbrook
• (Central Coast Regional District) Oweekeno
• (Ottawa) Overbrook
• (Ottawa) Ottawa South
• (Ottawa) Ottawa East
• (Regional Municipality of Niagara) Ostryhon Corners
• (Oxford County) Ostrander
• (Frontenac County) Oso
• (Algoma) Outlook
• (Lambton County) Osborne
• (United Counties of Leeds and Grenville) Outlet
• (Wellington County) Oustic
• (Thunder Bay District) Ouimet
• (Regional District of Fraser-Fort George) Otway
• (Parry Sound District) Otter Lake
• (Hastings County) Otter Creek
• (Bruce County) Otter Creek
• (Charlotte County) Otter Cove