| Fort Lewis to Orbetello | 5,635.63 mi (9,069.66 km) |
| Fort Lewis to Oria | 5,909.32 mi (9,510.14 km) |
| Fort Lewis to Oristano | 5,717.43 mi (9,201.32 km) |
| Fort Lewis to Orta Nova | 5,813.18 mi (9,355.40 km) |
| Fort Lewis to Orte | 5,663.79 mi (9,114.99 km) |
| Fort Lewis to Ortona | 5,719.54 mi (9,204.71 km) |
| Fort Lewis to Orvieto | 5,641.38 mi (9,078.93 km) |
| Fort Lewis to Orzinuovi | 5,426.89 mi (8,733.74 km) |
| Fort Lewis to Osimo | 5,628.61 mi (9,058.38 km) |
| Fort Lewis to Ospitaletto | 5,421.14 mi (8,724.49 km) |
| Fort Lewis to Ostuni | 5,893.68 mi (9,484.96 km) |
| Fort Lewis to Ottaviano | 5,813.04 mi (9,355.18 km) |
| Fort Lewis to Ovada | 5,439.38 mi (8,753.83 km) |
| Fort Lewis to Ozieri | 5,688.41 mi (9,154.61 km) |
| Fort Lewis to Paceco | 5,938.68 mi (9,557.38 km) |
