City or town with O
- Orlando
- Oslo
- Ottawa
- Oakland
- Oxford
- Omaha
- Osaka
- Olympia
- Oldenburg
- Orleans
- Oklahoma city
- Oakville
- Oldham
- Oshawa
- Ocean City
- Okinawa
- Oswego
- Odessa
- Oviedo
- Oaxaca
- Ogden
- Oceanside
- Orville
- Oberhausen
- OMAN
- Orillia
- Odisha
- ostrava
- Oregon City
- Oban
- Ocala
- Oswestry
- Ozark
- Oroville
- Oberlin
- Oshkosh
- Oneonta
- Omsk
- Ouagadougou
- Orange City
- Oran
- Offenbach
- Orangeburg
- Oakdale
- Offaly
- Orono
- Ormskirk
- Oamaru
- Olney
- Olathe
- OREGON
- Opal
- Ossining
- Opelika
- Oneida
- Orlando Florida
- Oak Park
- oakwood
- Oconomowoc
- Overton
- Orion
- Owen sound
- Owatonna
- Owensboro
- olbia
- Oahu
- Overland Park
- Outer Banks
- Owen
- organ
- ottwa
- Old Bridge
- Oceana
- Oak Creek
- ONTARIO
- Omen
- Osborne
- Oswald
- Orania
- Ocean
- Olovo
- oyster bay
- ommen
- Okehampton
- Orinda
- Olean
- Olivia
- Otorohanga
- Olive
- Otsego
- Ostia
- Oberon
- Otley
- Oświęcim
- Oakleigh
- Odesa
- open
- Outback
- ottoman
- Orizaba
Les mots dans la liste City or town with O proviennent des joueurs du jeu de mots Le Petit Bac.