| Viterbo to Alfena | 1,062.60 mi (1,710.10 km) |
| Viterbo to Alijo | 1,008.57 mi (1,623.14 km) |
| Viterbo to Aljustrel | 1,111.48 mi (1,788.75 km) |
| Viterbo to Almada | 1,142.50 mi (1,838.68 km) |
| Viterbo to Almargem | 1,144.38 mi (1,841.70 km) |
| Viterbo to Almeirim | 1,103.26 mi (1,775.53 km) |
| Viterbo to Amadora | 1,145.07 mi (1,842.82 km) |
| Viterbo to Amarante | 1,038.85 mi (1,671.87 km) |
| Viterbo to Amares | 1,048.03 mi (1,686.64 km) |
| Viterbo to Amora | 1,141.77 mi (1,837.51 km) |
| Viterbo to Anadia | 1,070.13 mi (1,722.20 km) |
| Viterbo to Angra do Heroismo | 2,062.37 mi (3,319.07 km) |
| Viterbo to Ansiao | 1,079.36 mi (1,737.07 km) |
| Viterbo to Anta | 1,070.91 mi (1,723.47 km) |
| Viterbo to Arcos de Valdevez | 1,049.75 mi (1,689.41 km) |
