| Viterbo to Octeville | 824.35 mi (1,326.66 km) |
| Viterbo to Oignies | 704.27 mi (1,133.42 km) |
| Viterbo to Oissel | 712.42 mi (1,146.53 km) |
| Viterbo to Olivet | 622.70 mi (1,002.15 km) |
| Viterbo to Ollioules | 321.13 mi (516.81 km) |
| Viterbo to Olonne-sur-Mer | 739.64 mi (1,190.34 km) |
| Viterbo to Oloron-Sainte-Marie | 645.92 mi (1,039.51 km) |
| Viterbo to Onet Village | 495.76 mi (797.86 km) |
| Viterbo to Onnaing | 682.74 mi (1,098.76 km) |
| Viterbo to Orange | 385.53 mi (620.45 km) |
| Viterbo to Orchies | 697.35 mi (1,122.27 km) |
| Viterbo to Orleans | 623.85 mi (1,003.99 km) |
| Viterbo to Orly | 640.59 mi (1,030.93 km) |
| Viterbo to Ormesson-sur-Marne | 637.34 mi (1,025.70 km) |
| Viterbo to Orsay | 645.88 mi (1,039.44 km) |
