| Viseu to Orbetello | 994.49 mi (1,600.48 km) |
| Viseu to Oria | 1,336.00 mi (2,150.08 km) |
| Viseu to Oristano | 870.39 mi (1,400.76 km) |
| Viseu to Orta Nova | 1,229.16 mi (1,978.15 km) |
| Viseu to Orte | 1,054.33 mi (1,696.77 km) |
| Viseu to Ortona | 1,157.18 mi (1,862.30 km) |
| Viseu to Orvieto | 1,040.44 mi (1,674.43 km) |
| Viseu to Orzinuovi | 956.51 mi (1,539.36 km) |
| Viseu to Osimo | 1,111.42 mi (1,788.66 km) |
| Viseu to Ospitaletto | 965.67 mi (1,554.09 km) |
| Viseu to Ostuni | 1,331.01 mi (2,142.06 km) |
| Viseu to Ottaviano | 1,168.89 mi (1,881.14 km) |
| Viseu to Ovada | 883.44 mi (1,421.76 km) |
| Viseu to Ozieri | 885.93 mi (1,425.77 km) |
| Viseu to Paceco | 1,106.89 mi (1,781.37 km) |
