| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Oechta | city | Komi | Russia | 63.57 | 53.68 | 282 | 9637 |
| Oedatsjny | city | Sakha (Yakutiya) | Russia | 66.43 | 112.40 | 1033 | 0 |
| Oefa | city | Bashkortostan | Russia | 54.79 | 56.05 | 324 | 181212 |
| Oeglitsj | city | Yaroslavskaya Oblast' | Russia | 57.53 | 38.33 | 374 | 4825 |
| Oelan-Oede | city | Buryatiya | Russia | 51.83 | 107.61 | 1669 | 94918 |
| Oeljanofsk | city | Ul'yanovskaya Oblast' | Russia | 54.33 | 48.39 | 830 | 143391 |
| Oeljanovsk | city | Ul'yanovskaya Oblast' | Russia | 54.33 | 48.39 | 830 | 143391 |
| Oeroes-Martan | city | Chechnya | Russia | 43.13 | 45.54 | 830 | 40944 |
| Oesinsk | city | Komi | Russia | 65.99 | 57.53 | 216 | 5859 |
| Oessoeriejsk | city | Primorskiy Kray | Russia | 43.80 | 131.95 | 104 | 4917 |
| Oest-Nera | city | Sakha (Yakutiya) | Russia | 64.60 | 143.25 | 1669 | 0 |
| Oeëlen | city | Chukotskiy Avtonomnyy Okrug | Russia | 66.17 | -169.80 | 3 | 0 |