| Isabela to Orbetello | 4,774.02 mi (7,683.04 km) |
| Isabela to Oria | 5,122.80 mi (8,244.35 km) |
| Isabela to Oristano | 4,656.89 mi (7,494.54 km) |
| Isabela to Orta Nova | 5,013.80 mi (8,068.94 km) |
| Isabela to Orte | 4,833.26 mi (7,778.39 km) |
| Isabela to Ortona | 4,936.09 mi (7,943.87 km) |
| Isabela to Orvieto | 4,817.17 mi (7,752.49 km) |
| Isabela to Orzinuovi | 4,691.48 mi (7,550.21 km) |
| Isabela to Osimo | 4,879.32 mi (7,852.50 km) |
| Isabela to Ospitaletto | 4,697.43 mi (7,559.78 km) |
| Isabela to Ostuni | 5,117.16 mi (8,235.27 km) |
| Isabela to Ottaviano | 4,955.76 mi (7,975.52 km) |
| Isabela to Ovada | 4,632.52 mi (7,455.32 km) |
| Isabela to Ozieri | 4,673.82 mi (7,521.78 km) |
| Isabela to Paceco | 4,884.70 mi (7,861.17 km) |
