| Targu Ocna to Octeville | 1,320.01 mi (2,124.35 km) |
| Targu Ocna to Oignies | 1,117.02 mi (1,797.67 km) |
| Targu Ocna to Oissel | 1,197.33 mi (1,926.92 km) |
| Targu Ocna to Olivet | 1,163.37 mi (1,872.26 km) |
| Targu Ocna to Ollioules | 1,039.64 mi (1,673.14 km) |
| Targu Ocna to Olonne-sur-Mer | 1,345.44 mi (2,165.28 km) |
| Targu Ocna to Oloron-Sainte-Marie | 1,346.35 mi (2,166.73 km) |
| Targu Ocna to Onet Village | 1,170.13 mi (1,883.15 km) |
| Targu Ocna to Onnaing | 1,089.97 mi (1,754.14 km) |
| Targu Ocna to Orange | 1,068.47 mi (1,719.54 km) |
| Targu Ocna to Orchies | 1,106.10 mi (1,780.10 km) |
| Targu Ocna to Orleans | 1,162.80 mi (1,871.35 km) |
| Targu Ocna to Orly | 1,138.43 mi (1,832.12 km) |
| Targu Ocna to Ormesson-sur-Marne | 1,131.78 mi (1,821.42 km) |
| Targu Ocna to Orsay | 1,147.82 mi (1,847.24 km) |
