| Dunbar to Orbetello | 1,118.92 mi (1,800.74 km) |
| Dunbar to Oria | 1,405.96 mi (2,262.68 km) |
| Dunbar to Oristano | 1,221.70 mi (1,966.13 km) |
| Dunbar to Orta Nova | 1,302.97 mi (2,096.93 km) |
| Dunbar to Orte | 1,146.97 mi (1,845.87 km) |
| Dunbar to Ortona | 1,207.21 mi (1,942.82 km) |
| Dunbar to Orvieto | 1,124.50 mi (1,809.71 km) |
| Dunbar to Orzinuovi | 910.04 mi (1,464.56 km) |
| Dunbar to Osimo | 1,116.30 mi (1,796.51 km) |
| Dunbar to Ospitaletto | 904.58 mi (1,455.78 km) |
| Dunbar to Ostuni | 1,391.11 mi (2,238.77 km) |
| Dunbar to Ottaviano | 1,297.55 mi (2,088.21 km) |
| Dunbar to Ovada | 924.26 mi (1,487.45 km) |
| Dunbar to Ozieri | 1,186.00 mi (1,908.68 km) |
| Dunbar to Paceco | 1,426.23 mi (2,295.29 km) |
