| Boone to Orbetello | 4,723.36 mi (7,601.51 km) |
| Boone to Oria | 5,076.28 mi (8,169.49 km) |
| Boone to Oristano | 4,691.55 mi (7,550.32 km) |
| Boone to Orta Nova | 4,960.89 mi (7,983.78 km) |
| Boone to Orte | 4,774.34 mi (7,683.56 km) |
| Boone to Ortona | 4,866.28 mi (7,831.52 km) |
| Boone to Orvieto | 4,753.22 mi (7,649.57 km) |
| Boone to Orzinuovi | 4,568.47 mi (7,352.24 km) |
| Boone to Osimo | 4,786.04 mi (7,702.39 km) |
| Boone to Ospitaletto | 4,569.40 mi (7,353.73 km) |
| Boone to Ostuni | 5,065.13 mi (8,151.55 km) |
| Boone to Ottaviano | 4,924.40 mi (7,925.05 km) |
| Boone to Ovada | 4,537.52 mi (7,302.43 km) |
| Boone to Ozieri | 4,687.41 mi (7,543.65 km) |
| Boone to Paceco | 4,942.23 mi (7,953.75 km) |
