| Clarksburg to Opwijk | 3,847.45 mi (6,191.87 km) |
| Clarksburg to Ostend | 3,789.86 mi (6,099.19 km) |
| Clarksburg to Oud-Heverlee | 3,870.43 mi (6,228.86 km) |
| Clarksburg to Oud-Turnhout | 3,870.49 mi (6,228.94 km) |
| Clarksburg to Oudenaarde | 3,826.85 mi (6,158.72 km) |
| Clarksburg to Oudenburg | 3,794.17 mi (6,106.12 km) |
| Clarksburg to Oupeye | 3,913.13 mi (6,297.57 km) |
| Clarksburg to Overijse | 3,866.35 mi (6,222.30 km) |
| Clarksburg to Overpelt | 3,890.44 mi (6,261.06 km) |
| Clarksburg to Paal | 3,885.37 mi (6,252.90 km) |
| Clarksburg to Peer | 3,894.14 mi (6,267.02 km) |
| Clarksburg to Pepinster | 3,923.96 mi (6,315.01 km) |
| Clarksburg to Peruwelz | 3,834.71 mi (6,171.37 km) |
| Clarksburg to Perwez | 3,881.94 mi (6,247.39 km) |
| Clarksburg to Philippeville | 3,882.44 mi (6,248.18 km) |
