- Ob'
- Oblivskaya
- Obninsk
- Oboyan'
- Obsharovka
- Ocher
- Odesskoye
- Odintsovo
- Odoyev
- Ogodzha
- Okha
- Okhansk
- Okhotsk
- Okoneshnikovo
- Oksovskiy
- Oktyabr'sk
- Oktyabr'skiy
- Oktyabr'skiy
- Oktyabr’skiy
- Okulovka
- Ola
- Olëkminsk
- Olenegorsk
- Olenino
- Ol'ginka
- Ol’gino
- Ol'ginskaya
- Ol'ginskaya
- Ol'khovatka
- Olonets
- Olovyannaya
- Olym
- Omsk
- Omsukchan
- Omutinskiy
- Omutninsk
- Onega
- Onguday
- Onokhino
- Onokhoy
- Opalikha
- Oparino
- Opechenskiy Posad
- Opochka
- Oranzherei
- Orda
- Ordynskoye
- Ordzhonikidzevskaya
- Ordzhonikidzevskiy
- Orekhovo-Zuyevo
- Orel
- Orel-Izumrud
- Orenburg
- Orgtrud
- Orichi
- Orlik
- Orlov
- Orlovka
- Orlovo
- Orlovskiy
- Orlovskiy
- Orotukan
- Orsha
- Orshanka
- Orsk
- Orud'yevo
- Most searched in Russian Federation:
