| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Oi-Kas-Kibek | city | Chuvashiya | Russia | 55.61 | 47.18 | 830 | 3144 |
| Oi-Kas-Yandoba | city | Chuvashiya | Russia | 55.68 | 47.01 | 331 | 2836 |
| Oikas-Aslamas | city | Chuvashiya | Russia | 55.95 | 46.50 | 406 | 2384 |
| Oilava | city | Khanty-Mansiyskiy Avtonomnyy Okrug-Yugra | Russia | 60.12 | 64.92 | 213 | 0 |
| Oimekön | city | Sakha (Yakutiya) | Russia | 63.46 | 142.79 | 2509 | 0 |
| Oimiakon | city | Sakha (Yakutiya) | Russia | 63.46 | 142.79 | 2509 | 0 |
| Oimiakonas | city | Sakha (Yakutiya) | Russia | 63.46 | 142.79 | 2509 | 0 |
| Oimjakon | city | Sakha (Yakutiya) | Russia | 63.46 | 142.79 | 2509 | 0 |
| Oimjakona | city | Sakha (Yakutiya) | Russia | 63.46 | 142.79 | 2509 | 0 |
| Oimur | city | Buryatiya | Russia | 52.33 | 106.84 | 1669 | 414 |
| Oimyakan | city | Sakha (Yakutiya) | Russia | 63.46 | 142.79 | 2509 | 0 |
| Oina | city | Primorskiy Kray | Russia | 45.72 | 137.52 | 269 | 0 |
| Oinaanvaara | city | Kareliya | Russia | 61.52 | 29.98 | 232 | 596 |
| Oinanlahti | city | Kareliya | Russia | 65.12 | 30.42 | 357 | 0 |
| Oinasniemi | city | Kareliya | Russia | 65.12 | 30.42 | 357 | 0 |
| Oinolovo | city | Leningradskaya Oblast' | Russia | 60.27 | 30.43 | 265 | 447 |
| Oirat-Tura | city | Altay | Russia | 51.96 | 85.95 | 912 | 8352 |
| Oirekoy Ostroshek | city | Permskiy Kray | Russia | 57.67 | 55.18 | 374 | 1192 |
| Oirot-Tura | city | Altay | Russia | 51.96 | 85.95 | 912 | 8352 |
| Oischara | city | Chechnya | Russia | 43.26 | 46.25 | 390 | 10381 |
| Oiwake | city | Sakhalinskaya Oblast' | Russia | 46.96 | 142.70 | 78 | 13235 |
| Oiyavois | city | Kareliya | Russia | 61.68 | 30.77 | 42 | 4353 |