City or town with O
- Orlando
- Oslo
- Ottawa
- Oakland
- Oxford
- Osaka
- Omaha
- Olympia
- Oldenburg
- Ocean City
- Orleans
- Oakville
- Oshawa
- Oldham
- Okinawa
- Odessa
- Oregon City
- Oviedo
- Oswego
- Oaxaca
- Ogden
- Oberhausen
- Orillia
- Oceanside
- Oban
- Orville
- Odisha
- Oshkosh
- Orange City
- Ozark
- Oswestry
- Ouagadougou
- Ocala
- Oran
- Offenbach
- Oroville
- Orangeburg
- Omsk
- Oneonta
- Olney
- Opal
- Oamaru
- Oakdale
- Ormskirk
- organ
- Opelika
- Oberlin
- oakwood
- Owen sound
- Overton
- Orono
- Overland Park
- Ossining
- Omen
- Oak Park
- Oahu
- Owatonna
- Oneida
- Olathe
- Oconomowoc
- Ocean
- Owensboro
- Orion
- Orania
- Olive
- oyster bay
- Owen
- Otsego
- Otorohanga
- Ostia
- Orinda
- Olivia
- Olean
- Offaly
- Oberon
- orange country
- Opotiki
- open
- Old town road
- Old Bridge
- Ohakune
- Odesa
- Oceana
- oak grove
- Oak Creek
Slová v zozname City or town with O pochádzajú od hráčov slovnej hry Meno, Mesto, Zviera, Vec.