| South River to Orbetello | 4,232.17 mi (6,811.02 km) |
| South River to Oria | 4,584.98 mi (7,378.82 km) |
| South River to Oristano | 4,201.94 mi (6,762.37 km) |
| South River to Orta Nova | 4,469.60 mi (7,193.12 km) |
| South River to Orte | 4,283.08 mi (6,892.95 km) |
| South River to Ortona | 4,374.98 mi (7,040.84 km) |
| South River to Orvieto | 4,261.94 mi (6,858.94 km) |
| South River to Orzinuovi | 4,077.27 mi (6,561.73 km) |
| South River to Osimo | 4,294.77 mi (6,911.77 km) |
| South River to Ospitaletto | 4,078.23 mi (6,563.28 km) |
| South River to Ostuni | 4,573.83 mi (7,360.87 km) |
| South River to Ottaviano | 4,433.23 mi (7,134.59 km) |
| South River to Ovada | 4,046.22 mi (6,511.76 km) |
| South River to Ozieri | 4,197.26 mi (6,754.84 km) |
| South River to Paceco | 4,452.67 mi (7,165.88 km) |
