| Targu Ocna to Oerlinghausen | 898.66 mi (1,446.26 km) |
| Targu Ocna to Oestrich-Winkel | 893.46 mi (1,437.88 km) |
| Targu Ocna to Offenburg | 885.02 mi (1,424.30 km) |
| Targu Ocna to Oftersheim | 861.15 mi (1,385.89 km) |
| Targu Ocna to Ohrdruf | 789.57 mi (1,270.69 km) |
| Targu Ocna to Ohringen | 818.70 mi (1,317.57 km) |
| Targu Ocna to Olbernhau | 678.59 mi (1,092.08 km) |
| Targu Ocna to Olching | 728.74 mi (1,172.79 km) |
| Targu Ocna to Oldenburg | 945.30 mi (1,521.31 km) |
| Targu Ocna to Oldenburg in Holstein | 885.23 mi (1,424.63 km) |
| Targu Ocna to Olfen | 945.84 mi (1,522.17 km) |
| Targu Ocna to Olpe | 914.77 mi (1,472.17 km) |
| Targu Ocna to Olsberg | 893.43 mi (1,437.83 km) |
| Targu Ocna to Oranienburg | 746.72 mi (1,201.73 km) |
| Targu Ocna to Ortenberg | 852.32 mi (1,371.68 km) |
