Lahatsoratra rehetra
- O
- O'Brien, Texas
- O'Fallon, Missouri
- O'Neill, Nebraska
- O' Valley
- O.S.T.R.
- O. E. Hasse
- O. Henry
- O. J. Simpson
- O. W. Fischer
- OACI
- OBDII
- ONU
- OPEP
- OTAN
- Oahabisma
- Oak, Nebraska
- Oak Beach–Captree, New York
- Oak Creek, Wisconsin
- Oak Glen, San Bernardino County, Kalifornia
- Oak Grove, Kentucky
- Oak Grove, Loudoun County, Virginia
- Oak Grove, Minnesota
- Oak Grove Village, Missouri
- Oak Hall, Virginia
- Oak Harbor, Ohio
- Oak Harbor, Washington
- Oak Hill, Florida
- Oak Hill, Kansas
- Oak Hill, Ohio
- Oak Hill, Tennessee
- Oak Hill, West Virginia
- Oak Hills, Pennsylvania
- Oak Hills, San Bernardino County, Kalifornia
- Oak Level, Virginia
- Oak Park
- Oak Park, Michigan
- Oak Park Heights, Minnesota
- Oak Point, Texas
- Oak Ridge, Missouri
- Oak Ridge, Tennessee
- Oak Ridge North, Texas
- Oakdale, Kalifornia
- Oakdale, Minnesota
- Oakdale, Nebraska
- Oakdale, New York
- Oakdale, Pennsylvania
- Oakdale, Wisconsin
- Oakes, North Dakota
- Oakey
- Oakfield, Wisconsin
- Oakfield (vohitra), New York
- Oakford
- Oakhaven, Arkansas
- Oakhurst, Kalifornia
- Oakland, California
- Oakland, Cambria County, Pennsylvania
- Oakland, Iowa
- Oakland, Kalifornia
- Oakland, Kentucky
- Oakland, Nebraska
- Oakland, Oregon
- Oakland Acres, Iowa
- Oakland City, Indiana
- Oakland Park, Florida
- Oakleigh South
- Oakley, Idaho
- Oakley, Kalifornia
- Oakley, Kansas
- Oakley, Michigan
- Oakley, Utah
- Oakridge, Oregon
- Oaks, Missouri
- Oakton, Virginia
- Oakview, Missouri
- Oakville
- Oakville, Iowa
- Oakville, Kalifornia
- Oakville, Washington
- Oakwood, Cuyahoga County, Ohio
- Oakwood, Missouri
- Oakwood, Montgomery County, Ohio
- Oakwood, Paulding County, Ohio
- Oakwood Park, Missouri
- Oany
- Oasis, Riverside County, Kalifornia
- Oatley
- Oaxaca
- Oazu Nantoi
- Obadia
- Obadia (boky)
- Obafemi Martins
- Obaidullah Karimi
- Obama
- Obanazawa
- Obdulio Trasante
- Obeda
- Obedullaganj
- Obenheim
- Oberbronn
- Oberdorf-Spachbach
- Oberhaslach
- Oberhausbergen
- Oberhausen
- Oberhoffen-lès-Wissembourg
- Oberhoffen-sur-Moder
- Oberlauterbach
- Oberlin, Kansas
- Oberlin, Ohio
- Oberlin Smith
- Obermodern-Zutzendorf
- Obernai
- Oberon
- Oberon, North Dakota
- Oberrœdern
- Oberschaeffolsheim
- Obersoultzbach
- Obersteinbach
- Obert, Nebraska
- Oberá
- Obetz, Ohio
- Obi Metzger
- Obie Trotter
- Obies
- Obihiro
- Oblinghem
- Oblinghem, Pas-de-Calais
- Obonoma
- Obrad Zelić
- Obrechies
- Obterre
- Obtrée
- Ocara
- Ocauçu
- Ocaña
- Occagnes
- Occey
- Occhiatana
- Occoches
- Occoches, Somme
- Ocean Beach, New York
- Ocean Reef
- Ocean Shores, Washington
- Ocean Springs, Mississippi
- Oceanside, Kalifornia
- Oceanside, New York
- Ochancourt
- Ochancourt, Somme
- Oches
- Ochey
- Ocheyedan, Iowa
- Ochtezeele
- Ocoee, Florida
- Oconomowoc Lake, Wisconsin
- Oconto, Nebraska
- Ocotillo, Kalifornia
- Ocoyoacac
- Ocqueville
- Octa, Ohio
- Octave Chanute
- Octave Levenspiel
- Octave Mirbeau
- Octave Saxe
- Octavia, Nebraska
- Octavio Paz
- Octeville-sur-Mer
- Octon, Hérault
- Octávio Sérgio da Costa Moraes
- Ocuilan
- Oda Nobunaga
- Odawara
- Odd, West Virginia
- Odd Dahl
- Odd Sverressøn Klingenberg
- Ode
- Ode Guirbal
- Odebolt, Iowa
- Oded Golan
- Odell, Nebraska
- Odem, Texas
- Odessa
- Odessa, Minnesota
- Odessa, New York
- Odessa, Texas
- Odette Arnaud
- Odette Demailly
- Odette Fradet
- Odette Meunier
- Odette Mialon
- Odette Mougin
- Odette Payrard
- Odile Berger
- Odile Bienvenu
- Odile Brocheteau
- Odile Mégrier
- Odile Prépoint
- Odile Turpinat
- Odin, Minnesota
- Odisha
- Odisseas Vlachodimos
- Odomez
- Odon De-Pins
- Odone Belluzzi
- Odratzheim
- Ody
- Odéam Rakoto
- Oeiras
- Oeiras do Pará
- Oelwein, Iowa
- Oermingen
- Offa
- Offekerque
- Offekerque, Pas-de-Calais
- Offendorf
- Offerle, Kansas
- Offignies
- Offignies, Somme
- Offin
- Offin, Pas-de-Calais
- Offoy, Oise
- Offoy, Somme
- Offoy (Somme)
- Offranville
- Offrethun
- Offrethun, Pas-de-Calais
- Offroicourt
- Offwiller
- Ofira
- Ogallala, Nebraska
- Ogaminana
- Oganda
- Ogarita
- Ogawa
- Ogden, Iowa
- Ogden, Kansas
- Ogden, Utah
- Ogdensburg, New York
- Ogdensburg, Wisconsin
- Ogema, Minnesota
- Ogenne-Camptort
- Ogenyi Onazi
- Oger, Marne
- Ogeu-les-Bains
- Ogilvie, Minnesota
- Oglesby, Texas
- Ogliastro
- Ognes, Aisne
- Ognes, Marne
- Ognes, Oise
- Ognes (Oise)
- Ognjen Koroman
- Ognjen Vukojević
- Ognolles
- Ognon
- Ognon, Oise
- Ognon (Oise)
- Ognéville
- Oguchi Onyewu
- Ogéviller
- Ogōri-shimogō
- Oh Beom-seok
- Oh Jae-Suk
- Oh Jang-eun
- Oh Seung-hwan
- Ohabolana
- Ohabolana (boky ao amin'ny Baiboly)
- Ohafia-Ifigh
- Ohain, Nord
- Oherville
- Ohio
- Ohio City, Ohio
- Ohioville, Pennsylvania
- Ohiowa, Nebraska
- Ohis
- Ohlungen
- Ohnenheim
- Oier Olazábal
- Oignies
- Oignies, Pas-de-Calais
- Oigny, Côte-d'Or
- Oigny, Loir-et-Cher
- Oigny-en-Valois
- Oigoro (vahoaka)
- Oil City, Pennsylvania
- Oildale, Kalifornia
- Oilton, Oklahoma
- Oinville-Saint-Liphard
- Oinville-sous-Auneau
- Oinville-sur-Montcient
- Oiron
- Oiry
- Oise
- Oisemont
- Oisemont, Somme
- Oisilly
- Oisly
- Oisseau-le-Petit
- Oissel
- Oissy
- Oissy, Somme
- Oisy, Aisne
- Oisy, Nord
- Oisy-le-Verger
- Oisy-le-Verger, Pas-de-Calais
- Oizon
- Oizé
- Oiôta
- Oja Kodar
- Ojai, Kalifornia
- Ojiboey
- Ojibway
- Ojibway (teny)
- Ojiya
- Ok Formenoij
- Ok Formenoy
- Oka Nikolov
- Okabena, Minnesota
- Okan Aydin
- Okan Buruk
- Okanagan
- Okanogan, Washington
- Okaya
- Okayama
- Okazaki
- Oke Mesi
- Okegawa
- Okemah, Oklahoma
- Okene
- Oketo, Kansas
- Oki Kibatarō
- Okigwe
- Okinawa
- Oklahoma
- Oklahoma, Clearfield County, Pennsylvania
- Oklahoma, Pennsylvania
- Oklahoma City
- Oklahoma City, Oklahoma
- Oklee, Minnesota
- Okmulgee, Oklahoma
- Okoboji, Iowa
- Okolona, Mississippi
- Okoziasa
- Okoziasa (mpanjakan'i Israely)
- Okoziasa (mpanjakan'i Jodà)
- Okraina