| Port Washington to Orbetello | 4,186.97 mi (6,738.28 km) |
| Port Washington to Oria | 4,539.75 mi (7,306.03 km) |
| Port Washington to Oristano | 4,156.98 mi (6,690.02 km) |
| Port Washington to Orta Nova | 4,424.37 mi (7,120.34 km) |
| Port Washington to Orte | 4,237.86 mi (6,820.18 km) |
| Port Washington to Ortona | 4,329.74 mi (6,968.04 km) |
| Port Washington to Orvieto | 4,216.72 mi (6,786.16 km) |
| Port Washington to Orzinuovi | 4,032.01 mi (6,488.90 km) |
| Port Washington to Osimo | 4,249.52 mi (6,838.95 km) |
| Port Washington to Ospitaletto | 4,032.98 mi (6,490.45 km) |
| Port Washington to Ostuni | 4,528.60 mi (7,288.07 km) |
| Port Washington to Ottaviano | 4,388.04 mi (7,061.86 km) |
| Port Washington to Ovada | 4,000.98 mi (6,438.96 km) |
| Port Washington to Ozieri | 4,152.23 mi (6,682.36 km) |
| Port Washington to Paceco | 4,407.71 mi (7,093.53 km) |
