UpAlphabetical listing of Places in Prahova
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Ocina de Jos | city | Prahova | Romania | 45.18 | 25.60 | 1814 | 15552 |
| Ocina de Sus | city | Prahova | Romania | 45.20 | 25.60 | 2509 | 15416 |
| Odăile | city | Prahova | Romania | 44.82 | 26.05 | 341 | 18857 |
| Ogretin | city | Prahova | Romania | 45.27 | 26.08 | 1669 | 6980 |
| Ogretinu | city | Prahova | Romania | 45.27 | 26.08 | 1669 | 6980 |
| Olari | city | Prahova | Romania | 44.78 | 26.20 | 272 | 10227 |
| Olarii Vechi | city | Prahova | Romania | 44.78 | 26.22 | 262 | 10127 |
| Ologeni | city | Prahova | Romania | 44.73 | 25.95 | 403 | 5539 |
| Olteni | city | Prahova | Romania | 45.22 | 26.00 | 1669 | 13714 |
| Opăriţi | city | Prahova | Romania | 45.18 | 26.10 | 1669 | 17606 |
| Opština Câmpina | city | Prahova | Romania | 45.13 | 25.73 | 1669 | 53770 |
| Opština Mizil | city | Prahova | Romania | 45.02 | 26.45 | 357 | 20998 |
| Opština Sinaia | city | Prahova | Romania | 45.35 | 25.55 | 3759 | 14195 |
| Opština Vãlenii De Munte | city | Prahova | Romania | 45.18 | 26.03 | 1066 | 24600 |
| Oraşu Nou | city | Prahova | Romania | 45.00 | 25.73 | 928 | 15397 |
| Orzoaia de Jos | city | Prahova | Romania | 45.00 | 26.23 | 830 | 13978 |
| Orzoaia de Sus | city | Prahova | Romania | 45.00 | 26.23 | 830 | 13978 |
| Ostrovu | city | Prahova | Romania | 45.22 | 25.87 | 1669 | 8383 |
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