| Risca to Orbetello | 921.74 mi (1,483.39 km) |
| Risca to Oria | 1,248.12 mi (2,008.66 km) |
| Risca to Oristano | 982.73 mi (1,581.54 km) |
| Risca to Orta Nova | 1,136.55 mi (1,829.09 km) |
| Risca to Orte | 961.21 mi (1,546.91 km) |
| Risca to Ortona | 1,039.04 mi (1,672.18 km) |
| Risca to Orvieto | 938.63 mi (1,510.57 km) |
| Risca to Orzinuovi | 732.76 mi (1,179.27 km) |
| Risca to Osimo | 951.73 mi (1,531.66 km) |
| Risca to Ospitaletto | 731.05 mi (1,176.51 km) |
| Risca to Ostuni | 1,234.93 mi (1,987.43 km) |
| Risca to Ottaviano | 1,116.20 mi (1,796.35 km) |
| Risca to Ovada | 722.92 mi (1,163.43 km) |
| Risca to Ozieri | 954.36 mi (1,535.90 km) |
| Risca to Paceco | 1,208.92 mi (1,945.56 km) |
