| Tuam to Oria | 1,523.46 mi (2,451.77 km) |
| Tuam to Oristano | 1,245.05 mi (2,003.71 km) |
| Tuam to Orta Nova | 1,411.91 mi (2,272.25 km) |
| Tuam to Orte | 1,236.00 mi (1,989.15 km) |
| Tuam to Ortona | 1,314.41 mi (2,115.34 km) |
| Tuam to Orvieto | 1,213.46 mi (1,952.88 km) |
| Tuam to Orzinuovi | 1,008.13 mi (1,622.43 km) |
| Tuam to Osimo | 1,227.05 mi (1,974.75 km) |
| Tuam to Ospitaletto | 1,006.38 mi (1,619.61 km) |
| Tuam to Ostuni | 1,510.23 mi (2,430.47 km) |
| Tuam to Ottaviano | 1,391.02 mi (2,238.64 km) |
| Tuam to Ovada | 997.08 mi (1,604.64 km) |
| Tuam to Ozieri | 1,219.90 mi (1,963.24 km) |
| Tuam to Paceco | 1,477.38 mi (2,377.62 km) |
| Tuam to Pachino | 1,631.36 mi (2,625.42 km) |
