| Harlau to Opwijk | 1,050.32 mi (1,690.33 km) |
| Harlau to Ostend | 1,106.39 mi (1,780.56 km) |
| Harlau to Oud-Heverlee | 1,028.59 mi (1,655.36 km) |
| Harlau to Oud-Turnhout | 1,018.18 mi (1,638.60 km) |
| Harlau to Oudenaarde | 1,075.10 mi (1,730.20 km) |
| Harlau to Oudenburg | 1,102.69 mi (1,774.61 km) |
| Harlau to Oupeye | 985.36 mi (1,585.78 km) |
| Harlau to Overijse | 1,034.13 mi (1,664.28 km) |
| Harlau to Overpelt | 998.76 mi (1,607.36 km) |
| Harlau to Paal | 1,007.93 mi (1,622.11 km) |
| Harlau to Peer | 996.51 mi (1,603.72 km) |
| Harlau to Pepinster | 976.95 mi (1,572.25 km) |
| Harlau to Peruwelz | 1,074.62 mi (1,729.43 km) |
| Harlau to Perwez | 1,021.06 mi (1,643.24 km) |
| Harlau to Philippeville | 1,031.19 mi (1,659.54 km) |
