| Ferentino to Oerlinghausen | 742.44 mi (1,194.83 km) |
| Ferentino to Oestrich-Winkel | 627.35 mi (1,009.62 km) |
| Ferentino to Offenburg | 535.37 mi (861.60 km) |
| Ferentino to Oftersheim | 576.87 mi (928.38 km) |
| Ferentino to Ohrdruf | 643.08 mi (1,034.94 km) |
| Ferentino to Ohringen | 550.07 mi (885.25 km) |
| Ferentino to Olbernhau | 620.71 mi (998.93 km) |
| Ferentino to Olching | 460.04 mi (740.36 km) |
| Ferentino to Oldenburg | 825.60 mi (1,328.67 km) |
| Ferentino to Oldenburg in Holstein | 878.44 mi (1,413.71 km) |
| Ferentino to Olfen | 746.30 mi (1,201.05 km) |
| Ferentino to Olpe | 694.22 mi (1,117.24 km) |
| Ferentino to Olsberg | 704.92 mi (1,134.46 km) |
| Ferentino to Oranienburg | 764.94 mi (1,231.05 km) |
| Ferentino to Ortenberg | 631.84 mi (1,016.85 km) |
