| Great Neck to Orbetello | 4,190.36 mi (6,743.74 km) |
| Great Neck to Oria | 4,543.14 mi (7,311.48 km) |
| Great Neck to Oristano | 4,160.38 mi (6,695.48 km) |
| Great Neck to Orta Nova | 4,427.76 mi (7,125.79 km) |
| Great Neck to Orte | 4,241.25 mi (6,825.64 km) |
| Great Neck to Ortona | 4,333.13 mi (6,973.49 km) |
| Great Neck to Orvieto | 4,220.11 mi (6,791.62 km) |
| Great Neck to Orzinuovi | 4,035.39 mi (6,494.34 km) |
| Great Neck to Osimo | 4,252.91 mi (6,844.39 km) |
| Great Neck to Ospitaletto | 4,036.35 mi (6,495.88 km) |
| Great Neck to Ostuni | 4,531.98 mi (7,293.52 km) |
| Great Neck to Ottaviano | 4,391.43 mi (7,067.32 km) |
| Great Neck to Ovada | 4,004.37 mi (6,444.41 km) |
| Great Neck to Ozieri | 4,155.63 mi (6,687.83 km) |
| Great Neck to Paceco | 4,411.11 mi (7,099.00 km) |
