O
- O'Brien
- O'Connell
- O'Connor
- O'Dell
- O'Donnell Landing
- O'Grady Settlement
- O'Regan's
- O'Reilly's Bridge
- O-Tsaw-Las 5
- O-Ya-Kum-La 11
- Oak
- Oakbank
- Oak Bay
- Oak Bay
- Oak Brae
- Oakdale
- Oakdale No. 320
- Oakdene Point
- Oak Flats
- Oakgrove
- Oak Heights
- Oakhill Forest
- Oak Lake
- Oak Lake
- Oakland
- Oakland
- Oakland
- Oak Leaf
- Oako Beach
- Oak Orchard
- Oak Park
- Oak Point
- Oak Ridges
- Oak River
- Oak Valley
- Oakview Beach
- Oakville
- Oakville
- Oakville
- Oakwood
- Obabikong Indian Reserve No. 35B
- Obadjiwan Indian Reserve No. 15E
- Obakami
- Obed
- Oberon
- Ocean Man I.R. 69F
- Ocean Park
- Oceanview
- Ochapowace I.R. 71-1
- Ochapowace I.R. 71-7
- Ochapowace I.R. 71-13
- Ochapowace I.R. 71-14
- Ochapowace I.R. 71-15
- Ochapowace I.R. 71-18
- Ochapowace I.R. 71-32
- Ochapowace I.R. 71-33
- Ochapowace I.R. 71-42
- Ochapowace I.R. 71-43
- Ochapowace I.R. 71-44
- Ochapowace I.R. 71-51
- Ochapowace I.R. 71-55
- Ochapowace I.R. 71-56
- Ochapowace I.R. 71-69
- Ochapowace I.R. 71-72
- Ochapowace I.R. 71-123
- Ochre River
- Oconto
- Odanah
- Odanak 12
- Odell
- Odell River
- Odena
- Oderin
- Odessa
- Off Lake Corner
- Ogden
- Ogden's Beach
- Ogidaki
- Ohamil 1
- Ohaton
- Ohsweken
- Oil City
- Oil Springs
- Oinimitis 14
- Oja
- Ojibway
- Ojibway Island
- Oka
- Okanagan-Similkameen
- Okanagan 1
- Okanagan Centre
- Okanagan Falls
- Okanagan Landing
- Oke
- Okeamin 5
- Okema Beach
- Okno
- Okotoks
- Olalla
- Olcott
- Oldcastle
- Old Clemenes 16
- Old Cut
- Old Dans Landing
- Old England
- Oldfield
- Old Fort
- Old Fort I.R. 157B
- Old Fort Nelson
- Old Glenridge
- Old Killaloe
- Old Main Centre
- Old Mine Centre
- Old Perlican
- Old Remo
- Old Road Crossing
- Olds
- Old Town
- Old Woman's River
- Olha
- Olinda
- Oliphant
- Oliver
- Oliver
- Oliver's Landing
- Oliver Paipoonge
- Olivet
- Omagh
- Omeedjilawh Camp
- Omemee
- Omerville
- Omoah 9
- Onadsilth 9
- Onagon
- Onanole
- Onaping
- Onaping Dam
- Onaping Falls
- One Arrow I.R. 95
- One Arrow I.R. 95-1B
- One Arrow I.R. 95-1D
- One Arrow I.R. 95-1F
- One Arrow I.R. 95-1I
- One Arrow Indian Reserve No. 95-1J
- Oneida 41
- One Mile 6
- Onion Lake Indian Reserve No. 119-2
- Onondaga
- Onoway
- Oo-Oolth 8
- Oona River
- Ootischenia
- Opal
- Opasatika
- Opaskwayak C.N. 21 (Stony Point)
- Opaskwayak C.N. 21D
- Opaskwayak C.N. 21F
- Opaskwayak C.N. 21G
- Opaskwayak C.N. 21J
- Opaskwayak C.N. 21K
- Opaskwayak C.N. 21L
- Opaskwayak C.N. 21N
- Opaskwayak C.N. 21P
- Opaskwayak C.N. Root Lake 231
- Opaskwayak C.N. Salt Channel 21D
- Opaskwayak Cree Nation 21A
- Opaskwayak Cree Nation 21B
- Opaskwayak Cree Nation 21C
- Opaskwayak Cree Nation 21E
- Opaskwayak Cree Nation 21I
- Opatseeah 13
- Open Bay 8
- Openit 27
- Opeongo
- Opeongo Line
- Ophir
- Opitsat
- Opitsat 1
- Opocopa
- Orange Corners
- Orangeville
- Oranmore
- Orchard Grove
- Orchard Point
- Orchards Corner
- Orchardside
- Orchardville
- Orford
- Oriel
- Orient
- Orillia
- Oriole Parkway
- Orion
- Orkney Beach
- Orkney No. 244
- Orléans-Club
- Orland
- Orleans
- Ormond
- Ormond Beach
- Ormsby
- Ormstown
- Oro-Medonte
- Oro Beach
- Oro Lea Beach
- Orolow
- Oromocto
- Oromocto 26
- Orono
- Oro Park
- Oro Station
- Orr Lake
- Orrville
- Orsainville
- Orton
- Ortonville
- Orwell
- Orwell
- Ory
- Osaca
- Osborne Corners
- Osceola
- Oschawwinna 3
- Osgoode
- Oshawa
- Oskondaga
- Osland
- Osler
- Osmond
- Osnabruck Centre
- Osoyoos
- Osoyoos 1
- Osoyoos 3
- Ospringe
- Osseo
- Ossossane Beach
- Ostenfeld
- Ostrander
- Ostryhon Corners
- Oswald
- Oswego Park
- Othello
- Otonabee-South Monaghan
- Ottawa
- Otter
- Otterburne
- Otterburn Park
- Otterbury
- Otter Creek
- Otter Lake
- Otter Lake
- Otter Lake 2
- Ottermere
- Otterville
- Otthon
- Otto
- Ouje-Bougoumou
- Oungah
- Oungre
- Ououkinsh 5
- Oustic
- Outlet
- Outlook
- Outremont
- Outs 3
- Ouvry
- Overflow
- Overlea
- Owakonze
- Owenbrook
- Owendale
- Owen Sound
- Owh-Wis-Too-A-Wan 10
- Oxbow
- Oxbow
- Oxbow Park
- Oxdrift
- Oxenden
- Oxford
- Oxford Centre
- Oxford Mills
- Oxford Station
- Oxley
- Oxmead
- Oxtongue Lake
- Oxville
- Oyama
- Oyees 9
- Oyster Bay 12
- Oyster Bed Bridge
- Ozada
- Ozanam
- Ozerna
