| Annapolis to Orbetello | 4,382.74 mi (7,053.34 km) |
| Annapolis to Oria | 4,735.91 mi (7,621.71 km) |
| Annapolis to Oristano | 4,350.83 mi (7,001.99 km) |
| Annapolis to Orta Nova | 4,620.49 mi (7,435.95 km) |
| Annapolis to Orte | 4,433.84 mi (7,135.57 km) |
| Annapolis to Ortona | 4,525.99 mi (7,283.88 km) |
| Annapolis to Orvieto | 4,412.75 mi (7,101.64 km) |
| Annapolis to Orzinuovi | 4,228.64 mi (6,805.34 km) |
| Annapolis to Osimo | 4,446.01 mi (7,155.16 km) |
| Annapolis to Ospitaletto | 4,229.66 mi (6,806.98 km) |
| Annapolis to Ostuni | 4,724.82 mi (7,603.86 km) |
| Annapolis to Ottaviano | 4,583.75 mi (7,376.84 km) |
| Annapolis to Ovada | 4,197.21 mi (6,754.76 km) |
| Annapolis to Ozieri | 4,346.60 mi (6,995.17 km) |
| Annapolis to Paceco | 4,601.53 mi (7,405.44 km) |
