| Viterbo to Montemor-o-Novo | 1,095.49 mi (1,763.03 km) |
| Viterbo to Montemor-o-Velho | 1,087.51 mi (1,750.17 km) |
| Viterbo to Montijo | 1,129.33 mi (1,817.48 km) |
| Viterbo to Mortagua | 1,059.92 mi (1,705.78 km) |
| Viterbo to Moura | 1,069.71 mi (1,721.53 km) |
| Viterbo to Murtosa | 1,075.46 mi (1,730.79 km) |
| Viterbo to Nazare | 1,117.82 mi (1,798.95 km) |
| Viterbo to Nelas | 1,038.98 mi (1,672.08 km) |
| Viterbo to Obidos | 1,127.42 mi (1,814.41 km) |
| Viterbo to Odemira | 1,143.95 mi (1,841.01 km) |
| Viterbo to Odivelas | 1,141.03 mi (1,836.31 km) |
| Viterbo to Oeiras | 1,150.47 mi (1,851.50 km) |
| Viterbo to Olhao | 1,120.32 mi (1,802.98 km) |
| Viterbo to Oliveira de Azemeis | 1,065.74 mi (1,715.15 km) |
| Viterbo to Oliveira de Frades | 1,052.77 mi (1,694.27 km) |
