| Viterbo to Solofra | 179.17 mi (288.35 km) |
| Viterbo to Somma Lombardo | 281.82 mi (453.55 km) |
| Viterbo to Somma Vesuviana | 160.98 mi (259.07 km) |
| Viterbo to Sommacampagna | 215.24 mi (346.39 km) |
| Viterbo to Sona | 217.68 mi (350.32 km) |
| Viterbo to Sondrio | 281.71 mi (453.38 km) |
| Viterbo to Sora | 91.49 mi (147.23 km) |
| Viterbo to Sorbolo | 187.05 mi (301.02 km) |
| Viterbo to Soresina | 227.57 mi (366.25 km) |
| Viterbo to Sorisole | 259.48 mi (417.59 km) |
| Viterbo to Sorrento | 170.55 mi (274.47 km) |
| Viterbo to Sorso | 213.82 mi (344.12 km) |
| Viterbo to Sortino | 394.72 mi (635.24 km) |
| Viterbo to Soverato Marina | 347.86 mi (559.83 km) |
| Viterbo to Sovicille | 74.27 mi (119.52 km) |
