| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Obukhovo | city | Sankt-Peterburg | Russia | 59.84 | 30.45 | 9 | 6680 |
| Ol'gino | city | Sankt-Peterburg | Russia | 60.00 | 30.14 | 26 | 158201 |
| Olgino | city | Sankt-Peterburg | Russia | 60.00 | 30.14 | 26 | 158201 |
| Olkina | city | Sankt-Peterburg | Russia | 60.00 | 30.14 | 26 | 158201 |
| Olkino | city | Sankt-Peterburg | Russia | 60.00 | 30.14 | 26 | 158201 |
| Ol’gino | city | Sankt-Peterburg | Russia | 60.00 | 30.14 | 26 | 158201 |
| Oranienbaum | city | Sankt-Peterburg | Russia | 59.91 | 29.77 | 42 | 209648 |
| Oraniyenbaum | city | Sankt-Peterburg | Russia | 59.91 | 29.77 | 42 | 209648 |
| Orskoi | city | Sankt-Peterburg | Russia | 59.98 | 30.52 | 45 | 7003 |
| Otdeleniye Sovkhoza | city | Sankt-Peterburg | Russia | 59.76 | 30.36 | 137 | 230881 |
| Otdeleniye Sovkhoza Shushary | city | Sankt-Peterburg | Russia | 59.76 | 30.36 | 137 | 230881 |
| Ozerki | city | Sankt-Peterburg | Russia | 60.04 | 30.33 | 59 | 7003 |
| Ozierki | city | Sankt-Peterburg | Russia | 60.04 | 30.33 | 59 | 7003 |