| Portage to Orbetello | 4,638.75 mi (7,465.34 km) |
| Portage to Oria | 4,981.50 mi (8,016.96 km) |
| Portage to Oristano | 4,634.61 mi (7,458.69 km) |
| Portage to Orta Nova | 4,867.79 mi (7,833.96 km) |
| Portage to Orte | 4,685.46 mi (7,540.51 km) |
| Portage to Ortona | 4,771.00 mi (7,678.18 km) |
| Portage to Orvieto | 4,663.48 mi (7,505.14 km) |
| Portage to Orzinuovi | 4,466.60 mi (7,188.29 km) |
| Portage to Osimo | 4,686.11 mi (7,541.57 km) |
| Portage to Ospitaletto | 4,465.93 mi (7,187.22 km) |
| Portage to Ostuni | 4,969.01 mi (7,996.85 km) |
| Portage to Ottaviano | 4,839.15 mi (7,787.86 km) |
| Portage to Ovada | 4,445.45 mi (7,154.26 km) |
| Portage to Ozieri | 4,624.03 mi (7,441.66 km) |
| Portage to Paceco | 4,884.05 mi (7,860.11 km) |
