| Clemmons to Oerlinghausen | 4,274.41 mi (6,878.99 km) |
| Clemmons to Oestrich-Winkel | 4,302.67 mi (6,924.47 km) |
| Clemmons to Offenburg | 4,343.67 mi (6,990.46 km) |
| Clemmons to Oftersheim | 4,344.42 mi (6,991.67 km) |
| Clemmons to Ohrdruf | 4,388.05 mi (7,061.88 km) |
| Clemmons to Ohringen | 4,386.79 mi (7,059.85 km) |
| Clemmons to Olbernhau | 4,494.93 mi (7,233.89 km) |
| Clemmons to Olching | 4,491.59 mi (7,228.51 km) |
| Clemmons to Oldenburg | 4,225.03 mi (6,799.52 km) |
| Clemmons to Oldenburg in Holstein | 4,293.77 mi (6,910.16 km) |
| Clemmons to Olfen | 4,230.83 mi (6,808.86 km) |
| Clemmons to Olpe | 4,267.68 mi (6,868.16 km) |
| Clemmons to Olsberg | 4,284.27 mi (6,894.86 km) |
| Clemmons to Oranienburg | 4,426.53 mi (7,123.81 km) |
| Clemmons to Ortenberg | 4,335.11 mi (6,976.69 km) |
