| Nieder-Olm to Opwijk | 191.37 mi (307.99 km) |
| Nieder-Olm to Ostend | 249.03 mi (400.77 km) |
| Nieder-Olm to Oud-Heverlee | 168.41 mi (271.02 km) |
| Nieder-Olm to Oud-Turnhout | 171.42 mi (275.88 km) |
| Nieder-Olm to Oudenaarde | 212.94 mi (342.70 km) |
| Nieder-Olm to Oudenburg | 244.76 mi (393.91 km) |
| Nieder-Olm to Oupeye | 125.74 mi (202.36 km) |
| Nieder-Olm to Overijse | 172.70 mi (277.93 km) |
| Nieder-Olm to Overpelt | 152.05 mi (244.71 km) |
| Nieder-Olm to Paal | 154.44 mi (248.55 km) |
| Nieder-Olm to Peer | 147.44 mi (237.28 km) |
| Nieder-Olm to Pepinster | 114.83 mi (184.81 km) |
| Nieder-Olm to Peruwelz | 208.50 mi (335.55 km) |
| Nieder-Olm to Perwez | 157.57 mi (253.58 km) |
| Nieder-Olm to Philippeville | 163.28 mi (262.77 km) |
