Cities
- O Brien ON
- O Briens Landing ON
- O Donnell Landing ON
- O Grady Settlement ON
- O Hanly MB
- O Leary PE
- O Neil NB
- O Reilly s Bridge ON
- Oak Bay BC
- Oak Bay NB
- Oak Bay QC
- Oak Bluff MB
- Oak Flats ON
- Oak Haven NB
- Oak Heights ON
- Oak Hill NB
- Oak Hills BC
- Oak Lake Beach MB
- Oak Lake MB
- Oak Lake Reserve MB
- Oak Leaf ON
- Oak Mountain NB
- Oak Orchard ON
- Oak Park NS
- Oak Point MB
- Oak Point NB
- Oak River MB
- Oak Valley ON
- Oakbank MB
- Oakburn MB
- Oakdale ON
- Oakdale SK
- Oakdene Point ON
- Oakfield NS
- Oakhill Forest ON
- Oakhill NS
- Oakland MB
- Oakland NB
- Oakland NS
- Oakland ON
- Oakner MB
- Oakshela SK
- Oakview Beach ON
- Oakview MB
- Oakville MB
- Oakville NB
- Oakville ON
- Oakwood ON
- Oasis BC
- Obed AB
- Ocean Falls BC
- Ocean Grove BC
- Ocean Park BC
- Ocean Pond NL
- Ocean View PE
- Ochiltree BC
- Ochre Beach MB
- Ochre River MB
- Ochre River Rural Municipality MB
- Oconto ON
- Odanah MB
- Odanak QC
- Odell NB
- Odessa ON
- Odessa SK
- Off Lake Corner ON
- Ogden Mill NB
- Ogden NS
- Ogden QC
- Ogema SK
- Ogilvie NS
- Ogilvie YT
- Ohaton AB
- Ohio-Du-Barachois NB
- Ohsweken ON
- Oil City ON
- Oil Springs ON
- Ojibway Island ON
- Oka QC
- Okanagan BC
- Okanagan Centre BC
- Okanagan Falls BC
- Okanagan Landing BC
- Okanagan Mission BC
- Okla SK
- Okotoks AB
- Olalla BC
- Old Altona MB
- Old Barns NS
- Old Bella Bella BC
- Old Crow YT
- Old Cut ON
- Old Factory River QC
- Old Fort BC
- Old Fort Nelson BC
- Old Hogem BC
- Old Perlican NL
- Old Post SK
- Old Ridge NB
- Old Shop NL
- Old Stittsville ON
- Old Wives SK
- Old Woman s River ON
- Oldcastle ON
- Oldfield ON
- Oldham NS
- Olds AB
- Oleary PE
- Olha MB
- Olinda ON
- Oliphant ON
- Oliver BC
- Oliver NS
- Oliver s Landing BC
- Olivet ON
- Omemee ON
- Omerville QC
- Ompah ON
- Onanole MB
- Onaping Falls ON
- Onaping ON
- Onefour AB
- Onion Lake SK
- Onondaga ON
- Onoway AB
- Onslow Mountain NS
- Ootischenia BC
- Ootsa Lake BC
- Opal AB
- Opaskwayak MB
- Opasquia ON
- Ophir ON
- Opitsat BC
- Ops ON
- Orange Hill NB
- Orangeville ON
- Oranmore ON
- Orcadia SK
- Orchard Point ON
- Orchards Corner NB
- Orchardside ON
- Orchardville ON
- Ordale SK
- Oregon NS
- Orford Lake QC
- Orford QC
- Orford Twp ON
- Oriel ON
- Orient ON
- Orillia ON
- Orillia Township ON
- Oriole Parkway ON
- Orion AB
- Orkney Beach ON
- Orland ON
- Orleans ON
- Ormiston SK
- Ormond Beach ON
- Ormond ON
- Ormsby ON
- Ormstown QC
- Oro Beach ON
- Oro Lea Beach ON
- Oro ON
- Oro Park ON
- Oro Station ON
- Oro-Medonte ON
- Oromocto NB
- Oromocto West NB
- Orono ON
- Orr Lake ON
- Orr s Lake ON
- Orrville ON
- Orton ON
- Ortonville NB
- Orwell ON
- Osaca ON
- Osage SK
- Osborne Corner NB
- Osborne Corners ON
- Osborne Harbour NS
- Osborne MB
- Osborne ON
- Osceola ON
- Osgoode ON
- Oshawa ON
- Osnabruck Centre ON
- Osnaburgh House ON
- Oso ON
- Osoyoos BC
- Osprey Lake BC
- Ospringe ON
- Osseo ON
- Ossossane Beach ON
- Osterwick MB
- Ostrander ON
- Ostrea Lake NS
- Ostrom ON
- Ostryhon Corners ON
- Otis NB
- Otonabee Twp ON
- Otonabee-South Monaghan ON
- Ottawa Brook NS
- Ottawa ON
- Otter Brook NS
- Otter Cove NB
- Otter Creek ON
- Otter Lake NS
- Otter Lake QC
- Otter ON
- Otterburn Park QC
- Otterburne MB
- Ottermere ON
- Otterville ON
- Otthon SK
- Ottman - Murray Beach SK
- Otway BC
- Ouellette ON
- Oungah ON
- Oungre SK
- Oustic ON
- Outlet ON
- Outlook ON
- Outram NS
- Outram SK
- Outram Station SK
- Ouvry ON
- Overton NS
- Oweekeno BC
- Owen Sound ON
- Owenbrook ON
- Owl River AB
- Owls Head Harbour NS
- Owls Head NS
- Owlseye AB
- Oxbow Lake ON
- Oxbow NB
- Oxbow Park ON
- Oxbow SK
- Oxdrift ON
- Oxenden ON
- Oxford Centre ON
- Oxford House MB
- Oxford Junction NS
- Oxford Mills ON
- Oxford NS
- Oxford Station ON
- Oxley Beach ON
- Oxley ON
- Oxmead ON
- Oxtongue Lake ON
- Oyama BC
- Oyster Bay BC
- Oyster Bed PE
- Oyster River BC