- Ob’
- Oblivskaya
- Obninsk
- Obolensk
- Oboyan’
- Obraztsovka
- Obruchevo
- Obsharovka
- Obukhovo
- Obukhovo
- Obukhovo
- Obukhovskoye
- Ochakovo-Matveyevskoye
- Ochër
- Odesskoye
- Odintsovo
- Odoyev
- Ogodzha
- Okha
- Okhansk
- Okhotsk
- Okino-Klyuchi
- Okoneshnikovo
- Okoulovka
- Oksovskiy
- Oktyabr’sk
- Oktyabr’skiy
- Oktyabr’skiy
- Oktyabr’skiy
- Oktyabr’skiy
- Oktyabr’skiy
- Oktyabr’skiy
- Oktyabr’skiy Vtoroy
- Ol’ga
- Ol’ginka
- Ol’gino
- Ol’gino
- Ol’ginskaya
- Ol’ginskaya
- Ol’govo
- Ol’khovatka
- Ol'yavidovo
- Ola
- Olenegorsk
- Olenino
- Olenye
- Olenyok
- Olonets
- Olovyannaya
- Olym
- Olyokminsk
- Omoutninsk
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- Omsukchan
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- Onega
- Onezh’ye
- Onguday
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- Onokhoy
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- Opechenskiy Posad
- Opochka
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- Orekhovo
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- Orekhovo-Zouïevo
- Orel
- Orël-Izumrud
- Orenbourg
- Orevo
- Orgtrud
- Orichi
- Orlik
- Orlov
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- Orlovo
- Orlovskiy
- Orlovskiy
- Orlyanka
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- Orsk
- Orud’yevo
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- Ostrov
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- Otrada
- Otradnaya
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- Otradnoye
- Otradnoye
- Otradnoye
- Otradnyy
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- Oudatchny
- Ouelen
- Oufa
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- Oyëk
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- Ozërnyy
- Ozero-Krasilovo
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- Ozersk
- Ozërsk
- Ozëry
- Ozherel’ye