| New Cassel to Opwijk | 3,629.29 mi (5,840.77 km) |
| New Cassel to Ostend | 3,571.66 mi (5,748.02 km) |
| New Cassel to Oud-Heverlee | 3,652.26 mi (5,877.74 km) |
| New Cassel to Oud-Turnhout | 3,652.83 mi (5,878.67 km) |
| New Cassel to Oudenaarde | 3,608.45 mi (5,807.25 km) |
| New Cassel to Oudenburg | 3,575.94 mi (5,754.93 km) |
| New Cassel to Oupeye | 3,695.07 mi (5,946.64 km) |
| New Cassel to Overijse | 3,648.11 mi (5,871.06 km) |
| New Cassel to Overpelt | 3,672.80 mi (5,910.80 km) |
| New Cassel to Paal | 3,667.51 mi (5,902.28 km) |
| New Cassel to Peer | 3,676.43 mi (5,916.64 km) |
| New Cassel to Pepinster | 3,705.82 mi (5,963.95 km) |
| New Cassel to Peruwelz | 3,616.02 mi (5,819.43 km) |
| New Cassel to Perwez | 3,663.62 mi (5,896.03 km) |
| New Cassel to Philippeville | 3,663.69 mi (5,896.14 km) |
