| Plymstock to Orbetello | 908.64 mi (1,462.31 km) |
| Plymstock to Oria | 1,247.16 mi (2,007.11 km) |
| Plymstock to Oristano | 947.88 mi (1,525.47 km) |
| Plymstock to Orta Nova | 1,133.47 mi (1,824.14 km) |
| Plymstock to Orte | 952.55 mi (1,532.99 km) |
| Plymstock to Ortona | 1,036.62 mi (1,668.28 km) |
| Plymstock to Orvieto | 930.32 mi (1,497.21 km) |
| Plymstock to Orzinuovi | 732.95 mi (1,179.58 km) |
| Plymstock to Osimo | 952.25 mi (1,532.50 km) |
| Plymstock to Ospitaletto | 732.92 mi (1,179.52 km) |
| Plymstock to Ostuni | 1,234.77 mi (1,987.17 km) |
| Plymstock to Ottaviano | 1,107.15 mi (1,781.79 km) |
| Plymstock to Ovada | 712.33 mi (1,146.38 km) |
| Plymstock to Ozieri | 923.82 mi (1,486.75 km) |
| Plymstock to Paceco | 1,182.58 mi (1,903.18 km) |
