| Williamstown to Opwijk | 3,734.01 mi (6,009.30 km) |
| Williamstown to Ostend | 3,676.37 mi (5,916.54 km) |
| Williamstown to Oud-Heverlee | 3,756.98 mi (6,046.27 km) |
| Williamstown to Oud-Turnhout | 3,757.65 mi (6,047.36 km) |
| Williamstown to Oudenaarde | 3,713.12 mi (5,975.69 km) |
| Williamstown to Oudenburg | 3,680.65 mi (5,923.44 km) |
| Williamstown to Oupeye | 3,799.81 mi (6,115.21 km) |
| Williamstown to Overijse | 3,752.81 mi (6,039.56 km) |
| Williamstown to Overpelt | 3,777.62 mi (6,079.49 km) |
| Williamstown to Paal | 3,772.29 mi (6,070.91 km) |
| Williamstown to Peer | 3,781.24 mi (6,085.31 km) |
| Williamstown to Pepinster | 3,810.54 mi (6,132.48 km) |
| Williamstown to Peruwelz | 3,720.62 mi (5,987.76 km) |
| Williamstown to Perwez | 3,768.30 mi (6,064.50 km) |
| Williamstown to Philippeville | 3,768.27 mi (6,064.45 km) |
