| Davidson to Orbetello | 4,716.51 mi (7,590.49 km) |
| Davidson to Oria | 5,070.50 mi (8,160.19 km) |
| Davidson to Oristano | 4,680.62 mi (7,532.73 km) |
| Davidson to Orta Nova | 4,955.01 mi (7,974.31 km) |
| Davidson to Orte | 4,768.06 mi (7,673.46 km) |
| Davidson to Ortona | 4,860.85 mi (7,822.78 km) |
| Davidson to Orvieto | 4,747.10 mi (7,639.72 km) |
| Davidson to Orzinuovi | 4,564.43 mi (7,345.74 km) |
| Davidson to Osimo | 4,781.42 mi (7,694.95 km) |
| Davidson to Ospitaletto | 4,565.60 mi (7,347.62 km) |
| Davidson to Ostuni | 5,059.58 mi (8,142.60 km) |
| Davidson to Ottaviano | 4,917.38 mi (7,913.75 km) |
| Davidson to Ovada | 4,532.05 mi (7,293.62 km) |
| Davidson to Ozieri | 4,677.43 mi (7,527.60 km) |
| Davidson to Paceco | 4,931.16 mi (7,935.93 km) |
