| Ronciglione to Oerlinghausen | 688.91 mi (1,108.69 km) |
| Ronciglione to Oestrich-Winkel | 569.44 mi (916.42 km) |
| Ronciglione to Offenburg | 474.51 mi (763.65 km) |
| Ronciglione to Oftersheim | 519.38 mi (835.86 km) |
| Ronciglione to Ohrdruf | 594.12 mi (956.14 km) |
| Ronciglione to Ohringen | 495.00 mi (796.63 km) |
| Ronciglione to Olbernhau | 581.24 mi (935.41 km) |
| Ronciglione to Olching | 410.70 mi (660.96 km) |
| Ronciglione to Oldenburg | 772.37 mi (1,243.02 km) |
| Ronciglione to Oldenburg in Holstein | 832.07 mi (1,339.08 km) |
| Ronciglione to Olfen | 689.61 mi (1,109.82 km) |
| Ronciglione to Olpe | 637.50 mi (1,025.96 km) |
| Ronciglione to Olsberg | 650.19 mi (1,046.37 km) |
| Ronciglione to Oranienburg | 724.61 mi (1,166.15 km) |
| Ronciglione to Ortenberg | 577.22 mi (928.95 km) |
