| Two Rivers to Orbetello | 4,636.12 mi (7,461.12 km) |
| Two Rivers to Oria | 4,973.80 mi (8,004.55 km) |
| Two Rivers to Oristano | 4,642.23 mi (7,470.94 km) |
| Two Rivers to Orta Nova | 4,861.13 mi (7,823.24 km) |
| Two Rivers to Orte | 4,681.06 mi (7,533.44 km) |
| Two Rivers to Ortona | 4,763.89 mi (7,666.74 km) |
| Two Rivers to Orvieto | 4,658.85 mi (7,497.69 km) |
| Two Rivers to Orzinuovi | 4,458.22 mi (7,174.82 km) |
| Two Rivers to Osimo | 4,677.59 mi (7,527.86 km) |
| Two Rivers to Ospitaletto | 4,456.96 mi (7,172.78 km) |
| Two Rivers to Ostuni | 4,960.84 mi (7,983.70 km) |
| Two Rivers to Ottaviano | 4,835.52 mi (7,782.02 km) |
| Two Rivers to Ovada | 4,440.82 mi (7,146.82 km) |
| Two Rivers to Ozieri | 4,629.32 mi (7,450.18 km) |
| Two Rivers to Paceco | 4,890.23 mi (7,870.07 km) |
