| Portishead to Orbetello | 905.34 mi (1,457.01 km) |
| Portishead to Oria | 1,231.62 mi (1,982.10 km) |
| Portishead to Oristano | 967.19 mi (1,556.55 km) |
| Portishead to Orta Nova | 1,120.04 mi (1,802.53 km) |
| Portishead to Orte | 944.74 mi (1,520.41 km) |
| Portishead to Ortona | 1,022.53 mi (1,645.61 km) |
| Portishead to Orvieto | 922.16 mi (1,484.07 km) |
| Portishead to Orzinuovi | 716.26 mi (1,152.70 km) |
| Portishead to Osimo | 935.22 mi (1,505.10 km) |
| Portishead to Ospitaletto | 714.55 mi (1,149.95 km) |
| Portishead to Ostuni | 1,218.43 mi (1,960.88 km) |
| Portishead to Ottaviano | 1,099.73 mi (1,769.84 km) |
| Portishead to Ovada | 706.51 mi (1,137.01 km) |
| Portishead to Ozieri | 938.59 mi (1,510.52 km) |
| Portishead to Paceco | 1,192.90 mi (1,919.78 km) |
