| North Valley to Orbetello | 5,793.79 mi (9,324.20 km) |
| North Valley to Oria | 6,122.42 mi (9,853.08 km) |
| North Valley to Oristano | 5,812.19 mi (9,353.81 km) |
| North Valley to Orta Nova | 6,011.93 mi (9,675.26 km) |
| North Valley to Orte | 5,836.03 mi (9,392.18 km) |
| North Valley to Ortona | 5,914.38 mi (9,518.28 km) |
| North Valley to Orvieto | 5,813.55 mi (9,356.01 km) |
| North Valley to Orzinuovi | 5,608.05 mi (9,025.28 km) |
| North Valley to Osimo | 5,826.20 mi (9,376.36 km) |
| North Valley to Ospitaletto | 5,605.84 mi (9,021.73 km) |
| North Valley to Ostuni | 6,108.77 mi (9,831.12 km) |
| North Valley to Ottaviano | 5,991.02 mi (9,641.62 km) |
| North Valley to Ovada | 5,596.38 mi (9,006.51 km) |
| North Valley to Ozieri | 5,796.86 mi (9,329.15 km) |
| North Valley to Paceco | 6,058.14 mi (9,749.63 km) |
