| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| O-utori | city | Sakhalinskaya Oblast' | Russia | 48.80 | 142.90 | 3 | 432 |
| Obadomari | city | Sakhalinskaya Oblast' | Russia | 46.90 | 141.99 | 193 | 177 |
| Obara | city | Sakhalinskaya Oblast' | Russia | 46.76 | 142.50 | 29 | 298 |
| Obryvistoye | city | Sakhalinskaya Oblast' | Russia | 48.77 | 144.70 | 0 | 0 |
| Ochiai | city | Sakhalinskaya Oblast' | Russia | 47.33 | 142.79 | 55 | 745 |
| Ochiho | city | Sakhalinskaya Oblast' | Russia | 46.91 | 143.08 | 134 | 241 |
| Ochiyopoka | city | Sakhalinskaya Oblast' | Russia | 46.91 | 143.08 | 134 | 241 |
| Odasamu | city | Sakhalinskaya Oblast' | Russia | 47.65 | 142.57 | 22 | 487 |
| Odasu | city | Sakhalinskaya Oblast' | Russia | 48.32 | 142.15 | 111 | 180 |
| Ofuretsuma | city | Sakhalinskaya Oblast' | Russia | 46.43 | 143.38 | 114 | 284 |
| Ofutekoro | city | Sakhalinskaya Oblast' | Russia | 47.65 | 141.99 | 157 | 148 |
| Ogivo | city | Sakhalinskaya Oblast' | Russia | 52.40 | 143.20 | 9 | 104 |
| Ogon'ki | city | Sakhalinskaya Oblast' | Russia | 46.78 | 142.38 | 830 | 298 |
| Ogon’ki | city | Sakhalinskaya Oblast' | Russia | 46.78 | 142.38 | 830 | 298 |
| Ogorodnyy | city | Sakhalinskaya Oblast' | Russia | 50.82 | 142.08 | 0 | 40 |
| Ohadomari | city | Sakhalinskaya Oblast' | Russia | 46.90 | 141.99 | 193 | 177 |
| Ohatomari | city | Sakhalinskaya Oblast' | Russia | 46.90 | 141.99 | 193 | 177 |
| Ohodomari | city | Sakhalinskaya Oblast' | Russia | 46.90 | 141.99 | 193 | 177 |
| Ohoe | city | Sakhalinskaya Oblast' | Russia | 46.20 | 142.25 | 0 | 126 |
| Ohoi | city | Sakhalinskaya Oblast' | Russia | 46.20 | 142.25 | 0 | 126 |
| Ohoye | city | Sakhalinskaya Oblast' | Russia | 46.20 | 142.25 | 0 | 126 |
| Oiwake | city | Sakhalinskaya Oblast' | Russia | 46.96 | 142.70 | 78 | 13235 |
| Okbosok | city | Sakhalinskaya Oblast' | Russia | 52.12 | 143.02 | 19 | 149 |
| Okbysok | city | Sakhalinskaya Oblast' | Russia | 52.12 | 143.02 | 19 | 149 |
| Okeanskoye | city | Sakhalinskaya Oblast' | Russia | 50.20 | 155.75 | 173 | 88 |
| Okha | city | Sakhalinskaya Oblast' | Russia | 53.59 | 142.95 | 13 | 17138 |
| Okhe | city | Sakhalinskaya Oblast' | Russia | 53.59 | 142.95 | 13 | 17138 |
| Okhotomari | city | Sakhalinskaya Oblast' | Russia | 46.90 | 141.99 | 193 | 177 |
| Okhotskoje | city | Sakhalinskaya Oblast' | Russia | 46.86 | 143.16 | 3 | 103 |
| Okhotskoye | city | Sakhalinskaya Oblast' | Russia | 46.86 | 143.16 | 3 | 103 |
| Okhoye | city | Sakhalinskaya Oblast' | Russia | 46.20 | 142.25 | 0 | 126 |
| Oko | city | Sakhalinskaya Oblast' | Russia | 46.75 | 141.91 | 830 | 397 |
| Okonai | city | Sakhalinskaya Oblast' | Russia | 48.07 | 142.18 | 45 | 184 |
| Okoo | city | Sakhalinskaya Oblast' | Russia | 46.75 | 141.91 | 830 | 397 |
| Oktyabr'skiy | city | Sakhalinskaya Oblast' | Russia | 50.73 | 142.10 | 830 | 106 |
| Oktyabr'skoye | city | Sakhalinskaya Oblast' | Russia | 47.34 | 142.71 | 36 | 745 |
| Oktyabr’skiy | city | Sakhalinskaya Oblast' | Russia | 50.73 | 142.10 | 830 | 106 |
| Oktyabr’skoye | city | Sakhalinskaya Oblast' | Russia | 47.34 | 142.71 | 36 | 745 |
| Oku-Kawakami | city | Sakhalinskaya Oblast' | Russia | 47.12 | 142.59 | 830 | 9602 |
| Oku-kashibo | city | Sakhalinskaya Oblast' | Russia | 48.43 | 142.60 | 374 | 745 |
| Oku-naihoro | city | Sakhalinskaya Oblast' | Russia | 46.52 | 141.98 | 173 | 298 |
| Oku-nayoshi | city | Sakhalinskaya Oblast' | Russia | 46.43 | 141.95 | 72 | 298 |
| Okubati | city | Sakhalinskaya Oblast' | Russia | 46.60 | 143.08 | 3 | 144 |
| Okuhachi | city | Sakhalinskaya Oblast' | Russia | 46.60 | 143.08 | 3 | 144 |
| Okunaiporo | city | Sakhalinskaya Oblast' | Russia | 46.52 | 141.98 | 173 | 298 |
| Okusawa | city | Sakhalinskaya Oblast' | Russia | 47.77 | 142.25 | 830 | 298 |
| Okuzawa | city | Sakhalinskaya Oblast' | Russia | 47.77 | 142.25 | 830 | 298 |
| Okōsawa | city | Sakhalinskaya Oblast' | Russia | 46.73 | 141.95 | 321 | 692 |
| Ol'khovatka | city | Sakhalinskaya Oblast' | Russia | 46.58 | 142.38 | 55 | 240 |
| Ol'khovka | city | Sakhalinskaya Oblast' | Russia | 49.10 | 142.13 | 9 | 447 |
| Ol'shanka | city | Sakhalinskaya Oblast' | Russia | 48.85 | 141.95 | 9 | 280 |
| Olenevod | city | Sakhalinskaya Oblast' | Russia | 51.68 | 141.96 | 6 | 149 |
| Oleni | city | Sakhalinskaya Oblast' | Russia | 49.45 | 143.30 | 9 | 0 |
| Oleniy | city | Sakhalinskaya Oblast' | Russia | 49.45 | 143.30 | 9 | 0 |
| Olsjanka | city | Sakhalinskaya Oblast' | Russia | 48.85 | 141.95 | 9 | 280 |
| Ol’khovatka | city | Sakhalinskaya Oblast' | Russia | 46.58 | 142.38 | 55 | 240 |
| Ol’khovka | city | Sakhalinskaya Oblast' | Russia | 49.10 | 142.13 | 9 | 447 |
| Ol’shanka | city | Sakhalinskaya Oblast' | Russia | 48.85 | 141.95 | 9 | 280 |
| Omagari | city | Sakhalinskaya Oblast' | Russia | 47.03 | 142.43 | 1174 | 298 |
| Omagari-ekiteisho | city | Sakhalinskaya Oblast' | Russia | 47.03 | 142.43 | 1174 | 298 |
| Onekotan | city | Sakhalinskaya Oblast' | Russia | 49.39 | 154.82 | 98 | 79 |
| Onnai | city | Sakhalinskaya Oblast' | Russia | 49.59 | 142.15 | 39 | 296 |
| Onnay-Gava | city | Sakhalinskaya Oblast' | Russia | 49.59 | 142.15 | 39 | 296 |
| Onor | city | Sakhalinskaya Oblast' | Russia | 50.19 | 142.68 | 830 | 149 |
| Orekhovka | city | Sakhalinskaya Oblast' | Russia | 46.58 | 142.38 | 55 | 240 |
| Orekhovo | city | Sakhalinskaya Oblast' | Russia | 48.97 | 142.25 | 318 | 447 |
| Oren | city | Sakhalinskaya Oblast' | Russia | 49.45 | 143.30 | 9 | 0 |
| Orlovka | city | Sakhalinskaya Oblast' | Russia | 46.53 | 141.82 | 183 | 161 |
| Orlovo | city | Sakhalinskaya Oblast' | Russia | 48.85 | 141.95 | 9 | 307 |
| Orlovo | city | Sakhalinskaya Oblast' | Russia | 49.75 | 142.97 | 137 | 149 |
| Oroba | city | Sakhalinskaya Oblast' | Russia | 46.53 | 141.82 | 183 | 161 |
| Orobentomari | city | Sakhalinskaya Oblast' | Russia | 47.70 | 142.01 | 242 | 124 |
| Orube | city | Sakhalinskaya Oblast' | Russia | 47.70 | 142.01 | 242 | 124 |
| Orunbeuntomari | city | Sakhalinskaya Oblast' | Russia | 47.70 | 142.01 | 242 | 124 |
| Osaka | city | Sakhalinskaya Oblast' | Russia | 47.02 | 142.27 | 830 | 298 |
| Osakae | city | Sakhalinskaya Oblast' | Russia | 47.78 | 142.28 | 830 | 298 |
| Osakage | city | Sakhalinskaya Oblast' | Russia | 47.02 | 142.27 | 830 | 298 |
| Osava | city | Sakhalinskaya Oblast' | Russia | 46.92 | 142.74 | 157 | 14553 |
| Osawa | city | Sakhalinskaya Oblast' | Russia | 46.92 | 142.74 | 157 | 14553 |
| Oshiai | city | Sakhalinskaya Oblast' | Russia | 47.33 | 142.79 | 55 | 745 |
| Ostromysovka | city | Sakhalinskaya Oblast' | Russia | 47.25 | 143.02 | 3 | 308 |
| Ostrovmysovka | city | Sakhalinskaya Oblast' | Russia | 47.25 | 143.02 | 3 | 308 |
| Ostrovskiy | city | Sakhalinskaya Oblast' | Russia | 46.43 | 143.38 | 114 | 284 |
| Ostrovskiy | city | Sakhalinskaya Oblast' | Russia | 46.48 | 141.83 | 331 | 151 |
| Otani | city | Sakhalinskaya Oblast' | Russia | 47.24 | 142.75 | 82 | 745 |
| Otasamu | city | Sakhalinskaya Oblast' | Russia | 47.65 | 142.57 | 22 | 487 |
| Otasan | city | Sakhalinskaya Oblast' | Russia | 47.65 | 142.57 | 22 | 487 |
| Otasu | city | Sakhalinskaya Oblast' | Russia | 48.32 | 142.15 | 111 | 180 |
| Otatomo | city | Sakhalinskaya Oblast' | Russia | 48.28 | 142.16 | 22 | 199 |
| Otatomo | city | Sakhalinskaya Oblast' | Russia | 47.27 | 142.00 | 0 | 148 |
| Otazamu | city | Sakhalinskaya Oblast' | Russia | 47.65 | 142.57 | 22 | 487 |
| Otdeleniye Sovkhoza | city | Sakhalinskaya Oblast' | Russia | 46.92 | 142.60 | 830 | 3240 |
| Otdeleniye Sovkhoza Komsomolets | city | Sakhalinskaya Oblast' | Russia | 46.92 | 142.60 | 830 | 3240 |
| Ote | city | Sakhalinskaya Oblast' | Russia | 47.65 | 141.99 | 157 | 148 |
| Otiai | city | Sakhalinskaya Oblast' | Russia | 47.33 | 142.79 | 55 | 745 |
| Otiay | city | Sakhalinskaya Oblast' | Russia | 47.33 | 142.79 | 55 | 745 |
| Otiho | city | Sakhalinskaya Oblast' | Russia | 46.91 | 143.08 | 134 | 241 |
| Otikho | city | Sakhalinskaya Oblast' | Russia | 46.91 | 143.08 | 134 | 241 |
| Otoba | city | Sakhalinskaya Oblast' | Russia | 46.53 | 141.82 | 183 | 161 |
| Otomae | city | Sakhalinskaya Oblast' | Russia | 50.18 | 155.65 | 0 | 68 |
| Otoyo | city | Sakhalinskaya Oblast' | Russia | 46.78 | 142.38 | 830 | 298 |
| Otte | city | Sakhalinskaya Oblast' | Russia | 47.65 | 141.99 | 157 | 148 |
| Ouglegorsk | city | Sakhalinskaya Oblast' | Russia | 49.08 | 142.06 | 114 | 389 |
| Outiri | city | Sakhalinskaya Oblast' | Russia | 48.80 | 142.90 | 3 | 432 |
| Outoru | city | Sakhalinskaya Oblast' | Russia | 48.80 | 142.90 | 3 | 432 |
| Ozawa | city | Sakhalinskaya Oblast' | Russia | 46.92 | 142.74 | 157 | 14553 |
| Ozeretskoye | city | Sakhalinskaya Oblast' | Russia | 46.73 | 142.63 | 3 | 182 |
| Ozerki | city | Sakhalinskaya Oblast' | Russia | 51.05 | 142.63 | 295 | 298 |
| Ozernoye | city | Sakhalinskaya Oblast' | Russia | 46.61 | 143.13 | 0 | 199 |
| Ozernyy | city | Sakhalinskaya Oblast' | Russia | 53.46 | 142.89 | 101 | 573 |
| Ozerskij | city | Sakhalinskaya Oblast' | Russia | 46.61 | 143.13 | 0 | 199 |
| Ozhidaniyevo | city | Sakhalinskaya Oblast' | Russia | 47.03 | 142.39 | 1125 | 298 |
| Ozhidayevo | city | Sakhalinskaya Oblast' | Russia | 47.03 | 142.39 | 1125 | 298 |
| Ozyornoye | city | Sakhalinskaya Oblast' | Russia | 46.61 | 143.13 | 0 | 199 |
| Ozyorskiy | city | Sakhalinskaya Oblast' | Russia | 46.61 | 143.13 | 0 | 199 |
| Ozërskiy | city | Sakhalinskaya Oblast' | Russia | 46.61 | 143.13 | 0 | 199 |