| Viterbo to Amelia | 18.33 mi (29.50 km) |
| Viterbo to Anagni | 71.46 mi (115.00 km) |
| Viterbo to Ancona | 109.30 mi (175.90 km) |
| Viterbo to Andria | 231.43 mi (372.45 km) |
| Viterbo to Angri | 172.49 mi (277.60 km) |
| Viterbo to Anguillara Sabazia | 24.61 mi (39.61 km) |
| Viterbo to Anzio | 72.32 mi (116.39 km) |
| Viterbo to Anzola dell'Emilia | 153.96 mi (247.78 km) |
| Viterbo to Aosta | 329.92 mi (530.96 km) |
| Viterbo to Apricena | 176.52 mi (284.08 km) |
| Viterbo to Aprilia | 64.16 mi (103.25 km) |
| Viterbo to Aradeo | 350.52 mi (564.10 km) |
| Viterbo to Aragona | 355.77 mi (572.56 km) |
| Viterbo to Arco | 249.15 mi (400.96 km) |
| Viterbo to Arcola | 161.43 mi (259.80 km) |
