| Clarksburg to Nyon | 4,061.36 mi (6,536.12 km) |
| Clarksburg to Oberriet | 4,173.54 mi (6,716.66 km) |
| Clarksburg to Obersiggenthal | 4,115.03 mi (6,622.50 km) |
| Clarksburg to Oberwil | 4,083.32 mi (6,571.47 km) |
| Clarksburg to Oberwingert | 4,134.02 mi (6,653.06 km) |
| Clarksburg to Oftringen | 4,104.51 mi (6,605.56 km) |
| Clarksburg to Olten | 4,102.79 mi (6,602.80 km) |
| Clarksburg to Onex | 4,061.66 mi (6,536.60 km) |
| Clarksburg to Opfikon | 4,128.16 mi (6,643.63 km) |
| Clarksburg to Ostermundigen | 4,097.54 mi (6,594.35 km) |
| Clarksburg to Payerne | 4,078.16 mi (6,563.17 km) |
| Clarksburg to Pfaffikon | 4,139.28 mi (6,661.52 km) |
| Clarksburg to Plan-les-Ouates | 4,062.88 mi (6,538.57 km) |
| Clarksburg to Pratteln | 4,089.32 mi (6,581.13 km) |
| Clarksburg to Prilly | 4,072.53 mi (6,554.11 km) |
