| Barnstaple to Orbetello | 934.34 mi (1,503.68 km) |
| Barnstaple to Oria | 1,267.68 mi (2,040.13 km) |
| Barnstaple to Oristano | 982.80 mi (1,581.66 km) |
| Barnstaple to Orta Nova | 1,154.87 mi (1,858.59 km) |
| Barnstaple to Orte | 976.32 mi (1,571.23 km) |
| Barnstaple to Ortona | 1,057.62 mi (1,702.08 km) |
| Barnstaple to Orvieto | 953.90 mi (1,535.15 km) |
| Barnstaple to Orzinuovi | 752.26 mi (1,210.65 km) |
| Barnstaple to Osimo | 971.77 mi (1,563.92 km) |
| Barnstaple to Ospitaletto | 751.43 mi (1,209.32 km) |
| Barnstaple to Ostuni | 1,254.90 mi (2,019.57 km) |
| Barnstaple to Ottaviano | 1,131.27 mi (1,820.60 km) |
| Barnstaple to Ovada | 736.56 mi (1,185.38 km) |
| Barnstaple to Ozieri | 956.98 mi (1,540.11 km) |
| Barnstaple to Paceco | 1,214.26 mi (1,954.16 km) |
