| Greer to Orbetello | 4,802.59 mi (7,729.01 km) |
| Greer to Oria | 5,156.29 mi (8,298.25 km) |
| Greer to Oristano | 4,767.65 mi (7,672.79 km) |
| Greer to Orta Nova | 5,040.82 mi (8,112.42 km) |
| Greer to Orte | 4,853.99 mi (7,811.74 km) |
| Greer to Ortona | 4,946.53 mi (7,960.67 km) |
| Greer to Orvieto | 4,832.98 mi (7,777.93 km) |
| Greer to Orzinuovi | 4,649.68 mi (7,482.93 km) |
| Greer to Osimo | 4,866.85 mi (7,832.44 km) |
| Greer to Ospitaletto | 4,650.76 mi (7,484.68 km) |
| Greer to Ostuni | 5,145.30 mi (8,280.56 km) |
| Greer to Ottaviano | 5,003.51 mi (8,052.37 km) |
| Greer to Ovada | 4,617.73 mi (7,431.52 km) |
| Greer to Ozieri | 4,764.27 mi (7,667.35 km) |
| Greer to Paceco | 5,018.22 mi (8,076.05 km) |
