Canadá
Países do mundo
O
- (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