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
- Oberlin
- Oroville
- Oshkosh
- Omsk
- Oneonta
- Ouagadougou
- Offenbach
- Orange City
- Oran
- Offaly
- Orangeburg
- Oakdale
- Orono
- Oamaru
- Ormskirk
- Olathe
- Olney
- Opal
- OREGON
- Ossining
- Opelika
- oakwood
- Oak Park
- Orlando Florida
- Oneida
- Oconomowoc
- Overton
- Owatonna
- Owen sound
- Orion
- Owensboro
- olbia
- Oahu
- Overland Park
- Outer Banks
- organ
- Owen
- Oswald
- Oceana
- Oak Creek
- Old Bridge
- ONTARIO
- Orania
- ottwa
- Osborne
- Omen
- Ocean
- Olovo
- oyster bay
- Okehampton
- ommen
- Orinda
- Ostia
- Oberon
- Olive
- Otorohanga
- Olivia
- Olean
- Otsego
- Old town road
- orange country
- Oakleigh
- Orizaba
- ottoman
- Otley
- open
- Ohakune
Slová v zozname City or town with O pochádzajú od hráčov slovnej hry Meno, Mesto, Zviera, Vec.