Canada
Pays du monde
O
- (Estrie) Oliver Corner
- (Oxford County) Oliver
- (Northern Rockies Regional Municipality) Old Fort Nelson
- (Bruce County) Old Woman's River
- (Outaouais) Old Chelsea
- (Ottawa) Old Stittsville
- (Laurentides) Oka-sur-la-Montagne
- (Skeena-Queen Charlotte Regional District) Old Massett
- (Regional District of Central Okanagan) Okanagan Mission
- (Gaspésie-Îles-de-la-Madeleine) Old-Harry
- (Regional District of Central Okanagan) Okanagan Centre
- (Parry Sound District) Ojibway Island
- (Lambton County) Oakdale
- (Metro Vancouver Regional District) Oakridge
- (United Counties of Leeds and Grenville) Oak Leaf
- (Brant) Oakland
- (Lunenburg County) Oakland
- (Peterborough County) Oak Lake
- (Central Coast Regional District) Ocean Falls
- (Thompson-Nicola Regional District) Oak Hills
- (Mauricie) Obedjiwan
- (Abitibi-Témiscamingue) Obaska
- (Northumberland County) Oak Heights
- (Nord-du-Québec) Obalski
- (Charlotte County) Oak Haven
- (Renfrew County) Oakgrove
- (Frontenac County) Oak Flats
- (Skeena-Queen Charlotte Regional District) Osborne Islands
- (Strathcona Regional District) Okis Islands
- (Strathcona Regional District) Octopus Islands