| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Oborino | city | Ul'yanovskaya Oblast' | Russia | 54.13 | 47.16 | 830 | 1268 |
| Obraztsovyy | city | Ul'yanovskaya Oblast' | Russia | 53.98 | 46.38 | 830 | 866 |
| Obukhovka | city | Ul'yanovskaya Oblast' | Russia | 53.21 | 48.05 | 370 | 829 |
| Obukhovskiye | city | Ul'yanovskaya Oblast' | Russia | 53.45 | 46.83 | 1007 | 596 |
| Obukhovskiye Vyselki | city | Ul'yanovskaya Oblast' | Russia | 53.45 | 46.83 | 1007 | 596 |
| Odnodvorki | city | Ul'yanovskaya Oblast' | Russia | 54.19 | 47.01 | 830 | 1490 |
| Odnodvortsy | city | Ul'yanovskaya Oblast' | Russia | 53.32 | 47.81 | 830 | 1247 |
| Odnodvortsy | city | Ul'yanovskaya Oblast' | Russia | 53.64 | 46.75 | 882 | 1192 |
| Oeljanofsk | city | Ul'yanovskaya Oblast' | Russia | 54.33 | 48.39 | 830 | 143391 |
| Oeljanovsk | city | Ul'yanovskaya Oblast' | Russia | 54.33 | 48.39 | 830 | 143391 |
| Ogarevka | city | Ul'yanovskaya Oblast' | Russia | 53.07 | 47.43 | 830 | 1193 |
| Okhotnich'ya | city | Ul'yanovskaya Oblast' | Russia | 54.21 | 48.08 | 830 | 2160 |
| Okhotnich’ya | city | Ul'yanovskaya Oblast' | Russia | 54.21 | 48.08 | 830 | 2160 |
| Okhotnitsja | city | Ul'yanovskaya Oblast' | Russia | 54.21 | 48.08 | 830 | 2160 |
| Oklino | city | Ul'yanovskaya Oblast' | Russia | 53.51 | 48.19 | 830 | 894 |
| Oktjabrskij | city | Ul'yanovskaya Oblast' | Russia | 53.02 | 47.93 | 830 | 1231 |
| Oktjabrskij | city | Ul'yanovskaya Oblast' | Russia | 54.34 | 48.71 | 288 | 8306 |
| Oktyabr'skiy | city | Ul'yanovskaya Oblast' | Russia | 52.75 | 47.13 | 1007 | 1937 |
| Oktyabr'skiy | city | Ul'yanovskaya Oblast' | Russia | 53.61 | 46.81 | 925 | 1103 |
| Oktyabr'skiy | city | Ul'yanovskaya Oblast' | Russia | 54.34 | 48.71 | 288 | 8306 |
| Oktyabr'skiy | city | Ul'yanovskaya Oblast' | Russia | 53.02 | 47.93 | 830 | 1231 |
| Oktyabr'skoye | city | Ul'yanovskaya Oblast' | Russia | 52.75 | 47.13 | 1007 | 1937 |
| Oktyabr’skiy | city | Ul'yanovskaya Oblast' | Russia | 54.34 | 48.71 | 288 | 8306 |
| Oktyabr’skiy | city | Ul'yanovskaya Oblast' | Russia | 52.75 | 47.13 | 1007 | 1937 |
| Oktyabr’skiy | city | Ul'yanovskaya Oblast' | Russia | 53.02 | 47.93 | 830 | 1231 |
| Oktyabr’skiy | city | Ul'yanovskaya Oblast' | Russia | 53.61 | 46.81 | 925 | 1103 |
| Oktyabr’skoye | city | Ul'yanovskaya Oblast' | Russia | 52.75 | 47.13 | 1007 | 1937 |
| Ol'khovka | city | Ul'yanovskaya Oblast' | Russia | 54.56 | 46.66 | 830 | 894 |
| Ol’khovka | city | Ul'yanovskaya Oblast' | Russia | 54.56 | 46.66 | 830 | 894 |
| Opalikha | city | Ul'yanovskaya Oblast' | Russia | 54.25 | 47.89 | 830 | 829 |
| Opytnaya Stantsiya | city | Ul'yanovskaya Oblast' | Russia | 54.10 | 47.45 | 830 | 1043 |
| Opytnyy | city | Ul'yanovskaya Oblast' | Russia | 53.77 | 47.13 | 830 | 686 |
| Orekhovka | city | Ul'yanovskaya Oblast' | Russia | 52.94 | 48.21 | 830 | 745 |
| Orekhovskiy | city | Ul'yanovskaya Oblast' | Russia | 53.01 | 48.26 | 830 | 1949 |
| Orlovka | city | Ul'yanovskaya Oblast' | Russia | 54.61 | 47.82 | 830 | 1789 |
| Orlovo | city | Ul'yanovskaya Oblast' | Russia | 53.73 | 47.04 | 830 | 1610 |
| Orlovo | city | Ul'yanovskaya Oblast' | Russia | 54.61 | 47.82 | 830 | 1789 |
| Os'kino | city | Ul'yanovskaya Oblast' | Russia | 53.83 | 46.29 | 830 | 8896 |
| Osipovka | city | Ul'yanovskaya Oblast' | Russia | 54.44 | 47.65 | 830 | 1788 |
| Oskino | city | Ul'yanovskaya Oblast' | Russia | 53.83 | 46.29 | 830 | 8896 |
| Osoka | city | Ul'yanovskaya Oblast' | Russia | 53.49 | 47.29 | 830 | 688 |
| Os’kino | city | Ul'yanovskaya Oblast' | Russia | 53.83 | 46.29 | 830 | 8896 |
| Otdeleniye Nomer Tri Uchebnogo Khozyaystva Sel'skokhozyaystvennogo Instituta | city | Ul'yanovskaya Oblast' | Russia | 54.22 | 48.82 | 311 | 298 |
| Otdeleniye Nomer Tri Uchebnogo Khozyaystva Sel’skokhozyaystvennogo Instituta | city | Ul'yanovskaya Oblast' | Russia | 54.22 | 48.82 | 311 | 298 |
| Otdeleniye Sovkhoza | city | Ul'yanovskaya Oblast' | Russia | 53.76 | 46.65 | 931 | 929 |
| Otdeleniye Sovkhoza | city | Ul'yanovskaya Oblast' | Russia | 53.91 | 49.65 | 830 | 298 |
| Otdeleniye Sovkhoza | city | Ul'yanovskaya Oblast' | Russia | 53.74 | 46.71 | 948 | 1143 |
| Otdeleniye Sovkhoza | city | Ul'yanovskaya Oblast' | Russia | 53.86 | 49.92 | 830 | 299 |
| Otdeleniye Sovkhoza | city | Ul'yanovskaya Oblast' | Russia | 53.99 | 49.92 | 830 | 419 |
| Otdeleniye Sovkhoza | city | Ul'yanovskaya Oblast' | Russia | 53.95 | 49.86 | 830 | 298 |
| Otdeleniye Sovkhoza Imeni Krupskoy Nomer Chetyre | city | Ul'yanovskaya Oblast' | Russia | 53.95 | 49.86 | 830 | 298 |
| Otdeleniye Sovkhoza Imeni Krupskoy Nomer Dva | city | Ul'yanovskaya Oblast' | Russia | 53.91 | 49.65 | 830 | 298 |
| Otdeleniye Sovkhoza Imeni Krupskoy Nomer Pyat' | city | Ul'yanovskaya Oblast' | Russia | 53.86 | 49.92 | 830 | 299 |
| Otdeleniye Sovkhoza Imeni Krupskoy Nomer Pyat’ | city | Ul'yanovskaya Oblast' | Russia | 53.86 | 49.92 | 830 | 299 |
| Otdeleniye Sovkhoza Imeni Krupskoy Nomer Tri | city | Ul'yanovskaya Oblast' | Russia | 53.99 | 49.92 | 830 | 419 |
| Otdeleniye Sovkhoza Possiya Tri | city | Ul'yanovskaya Oblast' | Russia | 54.14 | 47.99 | 830 | 792 |
| Otrada | city | Ul'yanovskaya Oblast' | Russia | 54.27 | 48.13 | 830 | 7368 |
| Otrada | city | Ul'yanovskaya Oblast' | Russia | 53.63 | 47.73 | 830 | 1043 |
| Otradinskiy | city | Ul'yanovskaya Oblast' | Russia | 53.53 | 46.60 | 830 | 1192 |
| Oulianovsk | city | Ul'yanovskaya Oblast' | Russia | 54.33 | 48.39 | 830 | 143391 |
| Oulyanovsk | city | Ul'yanovskaya Oblast' | Russia | 54.33 | 48.39 | 830 | 143391 |
| Ozerki | city | Ul'yanovskaya Oblast' | Russia | 52.71 | 47.01 | 980 | 1937 |
| Ozerki | city | Ul'yanovskaya Oblast' | Russia | 53.59 | 47.94 | 843 | 997 |
| Ozerki | city | Ul'yanovskaya Oblast' | Russia | 53.99 | 47.09 | 931 | 1205 |
| Ozerki | city | Ul'yanovskaya Oblast' | Russia | 54.28 | 49.10 | 413 | 298 |
| Ozernoye | city | Ul'yanovskaya Oblast' | Russia | 54.69 | 48.20 | 291 | 1810 |
| Ozero Mordovo | city | Ul'yanovskaya Oblast' | Russia | 53.98 | 49.70 | 390 | 298 |