| Lanham to Orbetello | 4,398.01 mi (7,077.91 km) |
| Lanham to Oria | 4,751.01 mi (7,646.01 km) |
| Lanham to Oristano | 4,366.68 mi (7,027.49 km) |
| Lanham to Orta Nova | 4,635.61 mi (7,460.29 km) |
| Lanham to Orte | 4,449.02 mi (7,160.00 km) |
| Lanham to Ortona | 4,541.05 mi (7,308.11 km) |
| Lanham to Orvieto | 4,427.91 mi (7,126.03 km) |
| Lanham to Orzinuovi | 4,243.48 mi (6,829.22 km) |
| Lanham to Osimo | 4,460.94 mi (7,179.18 km) |
| Lanham to Ospitaletto | 4,244.46 mi (6,830.80 km) |
| Lanham to Ostuni | 4,739.89 mi (7,628.11 km) |
| Lanham to Ottaviano | 4,599.04 mi (7,401.44 km) |
| Lanham to Ovada | 4,212.28 mi (6,779.00 km) |
| Lanham to Ozieri | 4,362.31 mi (7,020.46 km) |
| Lanham to Paceco | 4,617.38 mi (7,430.96 km) |
