| Barking to Orbetello | 817.08 mi (1,314.97 km) |
| Barking to Oria | 1,130.92 mi (1,820.03 km) |
| Barking to Oristano | 901.20 mi (1,450.34 km) |
| Barking to Orta Nova | 1,021.49 mi (1,643.93 km) |
| Barking to Orte | 852.05 mi (1,371.25 km) |
| Barking to Ortona | 924.03 mi (1,487.09 km) |
| Barking to Orvieto | 829.37 mi (1,334.74 km) |
| Barking to Orzinuovi | 618.46 mi (995.31 km) |
| Barking to Osimo | 834.99 mi (1,343.79 km) |
| Barking to Ospitaletto | 615.38 mi (990.36 km) |
| Barking to Ostuni | 1,117.18 mi (1,797.92 km) |
| Barking to Ottaviano | 1,006.24 mi (1,619.39 km) |
| Barking to Ovada | 618.54 mi (995.44 km) |
| Barking to Ozieri | 867.98 mi (1,396.88 km) |
| Barking to Paceco | 1,115.33 mi (1,794.96 km) |
