| Ferentino to Octeville | 902.02 mi (1,451.66 km) |
| Ferentino to Oignies | 779.63 mi (1,254.69 km) |
| Ferentino to Oissel | 789.79 mi (1,271.05 km) |
| Ferentino to Olivet | 700.40 mi (1,127.18 km) |
| Ferentino to Ollioules | 390.68 mi (628.73 km) |
| Ferentino to Olonne-sur-Mer | 815.50 mi (1,312.42 km) |
| Ferentino to Oloron-Sainte-Marie | 713.39 mi (1,148.08 km) |
| Ferentino to Onet Village | 568.77 mi (915.35 km) |
| Ferentino to Onnaing | 757.65 mi (1,219.32 km) |
| Ferentino to Orange | 459.29 mi (739.16 km) |
| Ferentino to Orchies | 772.48 mi (1,243.18 km) |
| Ferentino to Orleans | 701.55 mi (1,129.03 km) |
| Ferentino to Orly | 717.92 mi (1,155.38 km) |
| Ferentino to Ormesson-sur-Marne | 714.60 mi (1,150.03 km) |
| Ferentino to Orsay | 723.30 mi (1,164.03 km) |
