| Sidmouth to Orbetello | 889.22 mi (1,431.06 km) |
| Sidmouth to Oria | 1,223.26 mi (1,968.64 km) |
| Sidmouth to Oristano | 938.23 mi (1,509.94 km) |
| Sidmouth to Orta Nova | 1,110.28 mi (1,786.83 km) |
| Sidmouth to Orte | 931.37 mi (1,498.90 km) |
| Sidmouth to Ortona | 1,013.09 mi (1,630.41 km) |
| Sidmouth to Orvieto | 908.97 mi (1,462.85 km) |
| Sidmouth to Orzinuovi | 707.98 mi (1,139.39 km) |
| Sidmouth to Osimo | 927.51 mi (1,492.68 km) |
| Sidmouth to Ospitaletto | 707.32 mi (1,138.33 km) |
| Sidmouth to Ostuni | 1,210.55 mi (1,948.20 km) |
| Sidmouth to Ottaviano | 1,086.30 mi (1,748.23 km) |
| Sidmouth to Ovada | 691.54 mi (1,112.92 km) |
| Sidmouth to Ozieri | 912.10 mi (1,467.88 km) |
| Sidmouth to Paceco | 1,169.17 mi (1,881.60 km) |
