| Targu Ocna to Nasaud | 125.58 mi (202.10 km) |
| Targu Ocna to Navodari | 166.43 mi (267.84 km) |
| Targu Ocna to Negresti-Oas | 186.18 mi (299.63 km) |
| Targu Ocna to Nehoiu | 65.81 mi (105.92 km) |
| Targu Ocna to Ocna Mures | 131.88 mi (212.24 km) |
| Targu Ocna to Odobesti | 41.44 mi (66.69 km) |
| Targu Ocna to Odorheiu Secuiesc | 62.98 mi (101.35 km) |
| Targu Ocna to Oltenita | 151.54 mi (243.89 km) |
| Targu Ocna to Onesti | 7.28 mi (11.71 km) |
| Targu Ocna to Oradea | 229.34 mi (369.09 km) |
| Targu Ocna to Orastie | 166.61 mi (268.13 km) |
| Targu Ocna to Oravita | 253.17 mi (407.44 km) |
| Targu Ocna to Orsova | 230.99 mi (371.75 km) |
| Targu Ocna to Otelu Rosu | 211.79 mi (340.84 km) |
| Targu Ocna to Otopeni | 122.47 mi (197.10 km) |
