| Calverton to Orbetello | 4,398.96 mi (7,079.45 km) |
| Calverton to Oria | 4,751.82 mi (7,647.31 km) |
| Calverton to Oristano | 4,368.17 mi (7,029.89 km) |
| Calverton to Orta Nova | 4,636.43 mi (7,461.61 km) |
| Calverton to Orte | 4,449.90 mi (7,161.42 km) |
| Calverton to Ortona | 4,541.81 mi (7,309.34 km) |
| Calverton to Orvieto | 4,428.77 mi (7,127.41 km) |
| Calverton to Orzinuovi | 4,244.07 mi (6,830.17 km) |
| Calverton to Osimo | 4,461.60 mi (7,180.25 km) |
| Calverton to Ospitaletto | 4,245.02 mi (6,831.70 km) |
| Calverton to Ostuni | 4,740.67 mi (7,629.37 km) |
| Calverton to Ottaviano | 4,600.01 mi (7,403.01 km) |
| Calverton to Ovada | 4,213.05 mi (6,780.25 km) |
| Calverton to Ozieri | 4,363.68 mi (7,022.66 km) |
| Calverton to Paceco | 4,618.89 mi (7,433.38 km) |
