| West Chicago to Opwijk | 4,150.09 mi (6,678.92 km) |
| West Chicago to Ostend | 4,093.73 mi (6,588.23 km) |
| West Chicago to Oud-Heverlee | 4,172.88 mi (6,715.61 km) |
| West Chicago to Oud-Turnhout | 4,167.33 mi (6,706.67 km) |
| West Chicago to Oudenaarde | 4,132.37 mi (6,650.40 km) |
| West Chicago to Oudenburg | 4,098.23 mi (6,595.46 km) |
| West Chicago to Oupeye | 4,213.76 mi (6,781.39 km) |
| West Chicago to Overijse | 4,169.69 mi (6,710.47 km) |
| West Chicago to Overpelt | 4,186.93 mi (6,738.21 km) |
| West Chicago to Paal | 4,184.31 mi (6,733.99 km) |
| West Chicago to Peer | 4,191.32 mi (6,745.28 km) |
| West Chicago to Pepinster | 4,225.39 mi (6,800.11 km) |
| West Chicago to Peruwelz | 4,143.49 mi (6,668.30 km) |
| West Chicago to Perwez | 4,185.94 mi (6,736.62 km) |
| West Chicago to Philippeville | 4,191.28 mi (6,745.21 km) |
