| Callaway to Orbetello | 5,162.60 mi (8,308.41 km) |
| Callaway to Oria | 5,518.06 mi (8,880.46 km) |
| Callaway to Oristano | 5,119.32 mi (8,238.75 km) |
| Callaway to Orta Nova | 5,402.47 mi (8,694.44 km) |
| Callaway to Orte | 5,215.04 mi (8,392.80 km) |
| Callaway to Ortona | 5,309.06 mi (8,544.11 km) |
| Callaway to Orvieto | 5,194.34 mi (8,359.48 km) |
| Callaway to Orzinuovi | 5,014.83 mi (8,070.58 km) |
| Callaway to Osimo | 5,230.87 mi (8,418.27 km) |
| Callaway to Ospitaletto | 5,016.31 mi (8,072.98 km) |
| Callaway to Ostuni | 5,507.48 mi (8,863.43 km) |
| Callaway to Ottaviano | 5,363.05 mi (8,630.99 km) |
| Callaway to Ovada | 4,980.41 mi (8,015.20 km) |
| Callaway to Ozieri | 5,118.02 mi (8,236.66 km) |
| Callaway to Paceco | 5,369.31 mi (8,641.07 km) |
