| Truro to Orbetello | 942.05 mi (1,516.08 km) |
| Truro to Oria | 1,283.24 mi (2,065.17 km) |
| Truro to Oristano | 974.10 mi (1,567.67 km) |
| Truro to Orta Nova | 1,169.15 mi (1,881.57 km) |
| Truro to Orte | 987.09 mi (1,588.56 km) |
| Truro to Ortona | 1,072.58 mi (1,726.16 km) |
| Truro to Orvieto | 964.98 mi (1,552.98 km) |
| Truro to Orzinuovi | 770.05 mi (1,239.27 km) |
| Truro to Osimo | 989.01 mi (1,591.66 km) |
| Truro to Ospitaletto | 770.38 mi (1,239.81 km) |
| Truro to Ostuni | 1,271.05 mi (2,045.56 km) |
| Truro to Ottaviano | 1,141.35 mi (1,836.83 km) |
| Truro to Ovada | 746.90 mi (1,202.01 km) |
| Truro to Ozieri | 951.68 mi (1,531.58 km) |
| Truro to Paceco | 1,211.43 mi (1,949.60 km) |
