| Clemmons to Orbetello | 4,674.01 mi (7,522.10 km) |
| Clemmons to Oria | 5,027.79 mi (8,091.44 km) |
| Clemmons to Oristano | 4,639.11 mi (7,465.93 km) |
| Clemmons to Orta Nova | 4,912.31 mi (7,905.60 km) |
| Clemmons to Orte | 4,725.45 mi (7,604.87 km) |
| Clemmons to Ortona | 4,818.05 mi (7,753.90 km) |
| Clemmons to Orvieto | 4,704.45 mi (7,571.08 km) |
| Clemmons to Orzinuovi | 4,521.34 mi (7,276.40 km) |
| Clemmons to Osimo | 4,738.45 mi (7,625.80 km) |
| Clemmons to Ospitaletto | 4,522.46 mi (7,278.20 km) |
| Clemmons to Ostuni | 5,016.81 mi (8,073.78 km) |
| Clemmons to Ottaviano | 4,874.93 mi (7,845.44 km) |
| Clemmons to Ovada | 4,489.25 mi (7,224.75 km) |
| Clemmons to Ozieri | 4,635.68 mi (7,460.41 km) |
| Clemmons to Paceco | 4,889.70 mi (7,869.21 km) |
