| Fort Washington to Orbetello | 4,414.27 mi (7,104.08 km) |
| Fort Washington to Oria | 4,767.40 mi (7,672.39 km) |
| Fort Washington to Oristano | 4,382.42 mi (7,052.82 km) |
| Fort Washington to Orta Nova | 4,651.98 mi (7,486.64 km) |
| Fort Washington to Orte | 4,465.35 mi (7,186.28 km) |
| Fort Washington to Ortona | 4,557.47 mi (7,334.55 km) |
| Fort Washington to Orvieto | 4,444.26 mi (7,152.34 km) |
| Fort Washington to Orzinuovi | 4,260.06 mi (6,855.91 km) |
| Fort Washington to Osimo | 4,477.45 mi (7,205.77 km) |
| Fort Washington to Ospitaletto | 4,261.07 mi (6,857.53 km) |
| Fort Washington to Ostuni | 4,756.30 mi (7,654.53 km) |
| Fort Washington to Ottaviano | 4,615.29 mi (7,427.58 km) |
| Fort Washington to Ovada | 4,228.69 mi (6,805.43 km) |
| Fort Washington to Ozieri | 4,378.18 mi (7,046.00 km) |
| Fort Washington to Paceco | 4,633.11 mi (7,456.27 km) |
