Cities: O
in United States
- O’Fallon
- O’Neill
- Oak Brook
- Oak Creek
- Oak Forest
- Oak Grove
- Oak Harbor
- Oak Hill
- Oak Hills
- Oak Hills Place
- Oak Island
- Oak Lawn
- Oak Park
- Oak Park Heights
- Oak Point
- Oak Ridge
- Oak Ridge North
- Oak Trail Shores
- Oak Valley
- Oak View
- Oakbrook
- Oakbrook Terrace
- Oakdale
- Oakhurst
- Oakland
- Oakland City
- Oakland Park
- Oaklawn-Sunview
- Oakleaf Plantation
- Oakley
- Oaklyn
- Oakmont
- Oakridge
- Oakton
- Oakville
- Oakwood
- Oakwood Hills
- Oasis
- Oatfield
- Oberlin
- Obetz
- Ocala
- Ocala Estates
- Ocean Acres
- Ocean Bluff-Brant Rock
- Ocean City
- Ocean Grove
- Ocean Pines
- Ocean Pointe
- Ocean Shores
- Ocean Springs
- Ocean View
- Oceano
- Oceanport
- Oceanside
- Ocilla
- Ocoee
- Oconomowoc
- Oconto
- Oconto Falls
- Odell
- Odenton
- Odenville
- Odessa
- Oelwein
- Offutt AFB
- Ogallala
- Ogden
- Ogdensburg
- Oglesby
- Ohioville
- Oil City
- Oildale
- Ojai
- Ojus
- Okanogan
- Okauchee Lake
- Okeechobee
- Okemah
- Okemos
- Oklahoma City
- Okmulgee
- Okolona
- Olathe
- Old Bethpage
- Old Fig Garden
- Old Forge
- Old Greenwich
- Old Hill
- Old Jamestown
- Old Jefferson
- Old Mystic
- Old Stine
- Old Tappan
- Old Town
- Old Westbury
- Oldsmar
- Olean
- Olga
- Olivarez
- Olive Branch
- Olivehurst
- Oliver
- Oliver Springs
- Olivette
- Olmsted Falls
- Olney
- Olympia
- Olympia Fields
- Olympia Heights
- Olyphant
- Omaha
- Omak
- Omro
- On Top of the World Designated Place
- Onalaska
- Onawa
- Oneida
- Oneonta
- Ontario
- Oostburg
- Opa-locka
- Opelika
- Opelousas
- Opp
- Oracle
- Oradell
- Orange
- Orange Beach
- Orange City
- Orange Cove
- Orange Lake
- Orange Park
- Orangeburg
- Orangetree
- Orangevale
- Orchard City
- Orchard Homes
- Orchard Mesa
- Orchards
- Orchidlands Estates
- Orcutt
- Oregon City
- Oreland
- Orem
- Orinda
- Orland
- Orland Hills
- Orland Park
- Orlando
- Orlovista
- Ormond Beach
- Ormond-by-the-Sea
- Oro Valley
- Orofino
- Orono
- Oronogo
- Oronoque
- Orosi
- Oroville
- Oroville East
- Orrville
- Orting
- Orwigsburg
- Osage
- Osage Beach
- Osage City
- Osawatomie
- Osceola
- Oshkosh
- Oskaloosa
- Osprey
- Osseo
- Ossian
- Oswego
- Othello
- Otis Orchards-East Farms
- Otsego
- Ottawa
- Ottawa Hills
- Ottumwa
- Overland
- Overland Park
- Overlea
- Overton
- Oviedo
- Ovilla
- Owasso
- Owatonna
- Owensboro
- Owensville
- Owings Mills
- Owosso
- Oxford
- Oxnard
- Oxoboxo River
- Oxon Hill
- Ozark
- Ozona
in Worldwide
- Oadby
- Oak Bay
- Ōakashichō
- Oakengates
- Oakham
- Oakville
- Ōamishirasato
- Ōarai
- Oatlands
- Oaxaca
- Obama
- Obanazawa
- Ober-Ramstadt
- Oberasbach
- Oberderdingen
- Oberhaching
- Oberhausen
- Oberhausen-Rheinhausen
- Oberkirch
- Obernai
- Obernburg am Main
- Obernkirchen
- Oberriet
- Oberschleißheim
- Obersiggenthal
- Oberstdorf
- Obertraubling
- Obertshausen
- Oberursel
- Oberwil
- Oberwingert
- Óbidos
- Obihiro
- Obita
- Oborniki
- Oborniki Śląskie
- Ōbu
- Obuse
- Ocaña
- Ocara
- Occhiobello
- Ocho Rios
- Ochsenfurt
- Ochsenhausen
- Ochtrup
- Octeville
- Ocumare del Tuy
- Ōdachō-ōda
- Ōdate
- Odawara
- Odder
- Odemira
- Ödemiş
- Odense
- Odenthal
- Oderzo
- Odesa
- Odivelas
- Odranci
- Oegstgeest
- Oeiras
- Oeiras do Pará
- Oelde
- Oelsnitz
- Oer-Erkenschwick
- Oerlinghausen
- Oestrich-Winkel
- Offenburg
- Oftersheim
- Oftringen
- Ōfunato
- Oga
- Ōgaki
- Ogano
- Ogawa
- Ōgawara
- Oggiono
- Ogíjares
- Ogimachi
- Ogōri
- Ogose
- Ogōshi
- Ogre
- Ōguchi
- Ogulin
- Ōharu
- Ohrdruf
- Ohrid
- Öhringen
- Ōi
- Oiapoque
- Oignies
- Oirase
- Oirschot
- Ōiso
- Oissel
- Oisterwijk
- Ōita
- Ōizumi
- Ōji
- Ojiya
- Okagaki
- Okaya
- Okayama
- Okazaki
- Okegawa
- Ōki
- Okinawa
- Okinoshima
- Okotoks
- Okuizumo
- Olaine
- Olanchito
- Oława
- Olbernhau
- Olbia
- Olching
- Old Harbour
- Oldbury
- Oldebroek
- Oldenburg
- Oldenburg in Holstein
- Oldenzaal
- Oldham
- Olds
- Olecko
- Oleggio
- Oleiros
- Olen
- Olesa de Montserrat
- Oleśnica
- Olesno
- Olfen
- Olgiate Comasco
- Olgiate Olona
- Olhão
- Olho d’Água das Cunhãs
- Olho d’Água das Flores
- Olho d’Água do Casado
- Olímpia
- Olinda
- Olindina
- Oliva
- Olivares
- Oliveira
- Oliveira de Azemeis
- Oliveira de Frades
- Oliveira do Bairro
- Oliveira do Hospital
- Oliveira dos Brejinhos
- Olivença
- Olivenza
- Olivet
- Olkusz
- Ollerton
- Ollioules
- Olomouc
- Olonne-sur-Mer
- Oloron-Sainte-Marie
- Olot
- Olpe
- Olsberg
- Olsztyn
- Olten
- Olteniţa
- Olton
- Ōmachi
- Omaezaki
- Ōmagari
- Omagh
- Ōme
- Omegna
- Ōmihachiman
- Omiš
- Omitama
- Ōmiyachō
- Ommen
- Omsk
- Ōmura
- Omurtag
- Ōmuta
- Ōnan
- Oñate
- Onchan
- Onda
- Onet Village
- Onex
- Onga
- Onna
- Onnaing
- Ono
- Ōnojō
- Onomichi
- Onslow
- Onteniente
- Oostakker
- Oosterend
- Oosterhout
- Oosterwolde
- Oosterzele
- Oostkamp
- Oostzaan
- Opalenica
- Opatija
- Opava
- Opera
- Opfikon
- Opglabbeek
- Oplotnica
- Opmeer
- Opoczno
- Opole
- Oppeano
- Oppegård
- Opwijk
- Ōra
- Oradea
- Oraiókastro
- Oran
- Orange
- Orangeville
- Oranienburg
- Oranjestad
- Orbassano
- Orbetello
- Orchies
- Ordino
- Ordu
- Örebro
- Orël
- Orenburg
- Orestiáda
- Oria
- Orihuela
- Orillia
- Orimattila
- Oristano
- Orivesi
- Oriximiná
- Orizaba
- Orizona
- Örkelljunga
- Orlândia
- Orleães
- Orléans
- Orlová
- Orly
- Ormesby
- Ormesson-sur-Marne
- Ormož
- Ormskirk
- Örnsköldsvik
- Oro-Medonte
- Orobó
- Orocó
- Oromocto
- Oroqen Zizhiqi
- Orós
- Orpington
- Orsay
- Ørsta
- Orta Nova
- Orte
- Ortenberg
- Orthez
- Ortigueira
- Ortona
- Oruro
- Orvault
- Orvieto
- Orzesze
- Orzinuovi
- Os
- Ōsaka
- Ōsakasayama
- Ōsaki
- Ōsako
- Osan
- Osasco
- Ōsawa
- Oschatz
- Oschersleben
- Osh
- Oshawa
- Ōshū
- Osijek
- Osilnica
- Osimo
- Oskarshamn
- Öskemen
- Oslo
- Osmaniye
- Osnabrück
- Osny
- Osório
- Osorno
- Osowa
- Ospitaletto
- Oss
- Ossett
- Ostbevern
- Ostend
- Osterburg
- Ostercappeln
- Osterhofen
- Osterholz-Scharmbeck
- Ostermundigen
- Osternienburg
- Osterode
- Östersund
- Osterwieck
- Ostfildern
- Osthofen
- Ostrava
- Ostrhauderfehn
- Östringen
- Ostróda
- Ostrołęka
- Ostrov
- Ostrów Mazowiecka
- Ostrów Wielkopolski
- Ostrowiec Świętokrzyski
- Ostrzeszów
- Oststeinbek
- Ostuni
- Ostwald
- Osuna
- Osvaldo Cruz
- Oswaldtwistle
- Oswestry
- Oświęcim
- Ōta
- Ōta-ku
- Otacílio Costa
- Ōtake
- Ōtaki
- Otaru
- Ōtawara
- Otley
- Otočac
- Otofuke
- Otrokovice
- Ōtsu
- Ōtsuchi
- Ōtsuki
- Ottaviano
- Ottawa
- Ottendorf-Okrilla
- Ottersberg
- Ottobrunn
- Ottweiler
- Otwock
- Ouagadougou
- Oud-Beijerland
- Oud-Heverlee
- Oud-Turnhout
- Ōuda-yamaguchi
- Oudenaarde
- Oudenbosch
- Oudenburg
- Oudewater
- Ouistreham
- Oujda-Angad
- Oulgaret
- Oullins
- Oulu
- Oulunsalo
- Oupeye
- Ourém
- Ourense
- Ouriçangas
- Ouricuri
- Ourilândia do Norte
- Ourinhos
- Ouro Branco
- Ouro Fino
- Ouro Prêto
- Ouro Preto d’Oeste
- Ouro Verde
- Ouroeste
- Outreau
- Ouyen
- Ovada
- Ovar
- Ovenden
- Overath
- Overijse
- Overpelt
- Oviedo
- Owariasahi
- Owase
- Owen Sound
- Oxelösund
- Oxford
- Oxted
- Oyabe
- Oyama
- Ōyamazaki
- Ōyodo
- Oyonnax
- Oyrarbakki
- Oyten
- Ożarów Mazowiecki
- Ozieri
- Ozimek
- Ozoir-la-Ferrière
- Ozorków
- Ōzu