| Targu Ocna to Opwijk | 1,069.79 mi (1,721.67 km) |
| Targu Ocna to Ostend | 1,126.70 mi (1,813.24 km) |
| Targu Ocna to Oud-Heverlee | 1,047.56 mi (1,685.88 km) |
| Targu Ocna to Oud-Turnhout | 1,039.81 mi (1,673.42 km) |
| Targu Ocna to Oudenaarde | 1,093.77 mi (1,760.26 km) |
| Targu Ocna to Oudenburg | 1,122.82 mi (1,807.00 km) |
| Targu Ocna to Oupeye | 1,004.06 mi (1,615.88 km) |
| Targu Ocna to Overijse | 1,052.79 mi (1,694.30 km) |
| Targu Ocna to Overpelt | 1,020.09 mi (1,641.68 km) |
| Targu Ocna to Paal | 1,028.20 mi (1,654.73 km) |
| Targu Ocna to Peer | 1,017.41 mi (1,637.37 km) |
| Targu Ocna to Pepinster | 994.96 mi (1,601.23 km) |
| Targu Ocna to Peruwelz | 1,091.61 mi (1,756.78 km) |
| Targu Ocna to Perwez | 1,038.98 mi (1,672.08 km) |
| Targu Ocna to Philippeville | 1,046.78 mi (1,684.63 km) |
