| Code | Name | Region |
|---|---|---|
| RUPET | Pestovo | NGR |
| RUPEK | Petrokrepost | |
| RUOLK | Ol'khovatka | VOR |
| RUOYA | Olya | AST |
| RUOMS | Omsk | |
| RUONG | Onega | |
| RUOZE | Oranzherei | AST |
| RUHZO | Orekhovo-zuevo | MOS |
| RUORE | Orel | ORL |
| RUREN | Orenburg | |
| RUOSK | Orenburgskiy | ORE |
| RUORL | Or'ol | |
| RUOSW | Orsk | |
| RUOSS | Ossora | KAM |
| RUOSF | Ostafyevo International Airport | MOS |
| RUONE | Otradnoye | BRY |
| RUODY | Otradnoye | LEN |
| RUOTR | Otradnyy | |
| RUOZS | Ozeretskiy | MOS |
| RUOZK | Ozerko | MUR |
| RUOZR | Ozernovskiy | KAM |
| RUOZY | Ozery | |
| RUNOU | Novouralsk | ORE |
| RUNZV | Novozybkov | BRY |
| RUNYB | Novy Byt | MOS |
| RUNUX | Novy Urengoy | |
| RUNVY | Novyy | |
| RUNOJ | Noyabrsk | TYU |
| RUNYA | Nyagan | TYU |
| RUOBK | Obninsk | |
| RUOSO | Odintsovo | |
| RUOKA | Okha, Sakhalin | |
| RUOHO | Okhotsk | |
| RUOKZ | Okruzhnoe | SAK |
| RUOBY | Oktiabr'skiy | MOS |
| RUOKT | Oktyabr'skiy | |
| RUOYE | Oktyabrskoye | KHM |
| RUOKU | Okulovka | NGR |
| RUOMK | Olekminsk | SA |
| RUOLO | Oleniy Ostrov | |
| RUOLG | Olenya, Guba | |
| RUOLP | Ol'ga | PRI |
| RUNOG | Nogliki | SAK |
| RUNSK | Noril'sk | |
| RUAXZ | Novaya Igirma | IRK |
| RUNYY | Novaya Yelovka | KYA |
| RUNVR | Novgorod | |
| RUNOA | Novo-aleksandrovka | ROS |
| RUN5V | Novoaleksandrovsk | STA |
| RUNOY | Novoaltaysk | ALT |