| Trancoso to Orbetello | 963.76 mi (1,551.02 km) |
| Trancoso to Oria | 1,305.52 mi (2,101.03 km) |
| Trancoso to Oristano | 840.52 mi (1,352.68 km) |
| Trancoso to Orta Nova | 1,198.56 mi (1,928.89 km) |
| Trancoso to Orte | 1,023.60 mi (1,647.32 km) |
| Trancoso to Ortona | 1,126.46 mi (1,812.86 km) |
| Trancoso to Orvieto | 1,009.70 mi (1,624.95 km) |
| Trancoso to Orzinuovi | 926.30 mi (1,490.73 km) |
| Trancoso to Osimo | 1,080.69 mi (1,739.20 km) |
| Trancoso to Ospitaletto | 935.51 mi (1,505.56 km) |
| Trancoso to Ostuni | 1,300.48 mi (2,092.93 km) |
| Trancoso to Ottaviano | 1,138.40 mi (1,832.08 km) |
| Trancoso to Ovada | 853.02 mi (1,372.80 km) |
| Trancoso to Ozieri | 855.69 mi (1,377.10 km) |
| Trancoso to Paceco | 1,077.75 mi (1,734.47 km) |
