| Ronciglione to Oberkirch | 475.50 mi (765.24 km) |
| Ronciglione to Obernburg am Main | 541.98 mi (872.23 km) |
| Ronciglione to Obernkirchen | 704.29 mi (1,133.45 km) |
| Ronciglione to Oberschleissheim | 413.04 mi (664.72 km) |
| Ronciglione to Oberstdorf | 366.23 mi (589.39 km) |
| Ronciglione to Obertraubling | 461.30 mi (742.39 km) |
| Ronciglione to Obertshausen | 561.03 mi (902.88 km) |
| Ronciglione to Oberursel | 573.58 mi (923.08 km) |
| Ronciglione to Ochsenfurt | 518.86 mi (835.03 km) |
| Ronciglione to Ochsenhausen | 414.47 mi (667.02 km) |
| Ronciglione to Ochtrup | 724.09 mi (1,165.31 km) |
| Ronciglione to Odenthal | 650.32 mi (1,046.59 km) |
| Ronciglione to Oelde | 686.33 mi (1,104.54 km) |
| Ronciglione to Oelsnitz | 561.55 mi (903.72 km) |
| Ronciglione to Oer-Erkenschwick | 686.89 mi (1,105.44 km) |
