| Bad Harzburg to Opwijk | 281.89 mi (453.66 km) |
| Bad Harzburg to Ostend | 331.29 mi (533.16 km) |
| Bad Harzburg to Oud-Heverlee | 264.39 mi (425.49 km) |
| Bad Harzburg to Oud-Turnhout | 242.53 mi (390.31 km) |
| Bad Harzburg to Oudenaarde | 308.54 mi (496.55 km) |
| Bad Harzburg to Oudenburg | 328.43 mi (528.56 km) |
| Bad Harzburg to Oupeye | 227.40 mi (365.96 km) |
| Bad Harzburg to Overijse | 271.00 mi (436.14 km) |
| Bad Harzburg to Overpelt | 225.74 mi (363.30 km) |
| Bad Harzburg to Paal | 239.13 mi (384.84 km) |
| Bad Harzburg to Peer | 225.65 mi (363.14 km) |
| Bad Harzburg to Pepinster | 224.48 mi (361.26 km) |
| Bad Harzburg to Peruwelz | 316.37 mi (509.15 km) |
| Bad Harzburg to Perwez | 263.19 mi (423.56 km) |
| Bad Harzburg to Philippeville | 285.74 mi (459.86 km) |
