| Ferentino to Oberkirch | 535.87 mi (862.40 km) |
| Ferentino to Obernburg am Main | 597.12 mi (960.97 km) |
| Ferentino to Obernkirchen | 756.40 mi (1,217.31 km) |
| Ferentino to Oberschleissheim | 461.08 mi (742.04 km) |
| Ferentino to Oberstdorf | 421.75 mi (678.74 km) |
| Ferentino to Obertraubling | 505.90 mi (814.17 km) |
| Ferentino to Obertshausen | 616.69 mi (992.47 km) |
| Ferentino to Oberursel | 629.72 mi (1,013.43 km) |
| Ferentino to Ochsenfurt | 571.36 mi (919.52 km) |
| Ferentino to Ochsenhausen | 469.98 mi (756.36 km) |
| Ferentino to Ochtrup | 780.51 mi (1,256.11 km) |
| Ferentino to Odenthal | 708.53 mi (1,140.27 km) |
| Ferentino to Oelde | 741.22 mi (1,192.87 km) |
| Ferentino to Oelsnitz | 605.63 mi (974.67 km) |
| Ferentino to Oer-Erkenschwick | 743.95 mi (1,197.28 km) |
