| Greensboro to Orbetello | 4,646.42 mi (7,477.70 km) |
| Greensboro to Oria | 5,000.43 mi (8,047.41 km) |
| Greensboro to Oristano | 4,610.66 mi (7,420.13 km) |
| Greensboro to Orta Nova | 4,884.93 mi (7,861.54 km) |
| Greensboro to Orte | 4,697.98 mi (7,560.67 km) |
| Greensboro to Ortona | 4,790.78 mi (7,710.01 km) |
| Greensboro to Orvieto | 4,677.02 mi (7,526.94 km) |
| Greensboro to Orzinuovi | 4,494.41 mi (7,233.06 km) |
| Greensboro to Osimo | 4,711.37 mi (7,582.22 km) |
| Greensboro to Ospitaletto | 4,495.59 mi (7,234.95 km) |
| Greensboro to Ostuni | 4,989.51 mi (8,029.83 km) |
| Greensboro to Ottaviano | 4,847.29 mi (7,800.96 km) |
| Greensboro to Ovada | 4,461.98 mi (7,180.86 km) |
| Greensboro to Ozieri | 4,607.42 mi (7,414.93 km) |
| Greensboro to Paceco | 4,861.21 mi (7,823.36 km) |
