| Neu Isenburg to Opwijk | 208.29 mi (335.21 km) |
| Neu Isenburg to Ostend | 265.93 mi (427.98 km) |
| Neu Isenburg to Oud-Heverlee | 185.52 mi (298.56 km) |
| Neu Isenburg to Oud-Turnhout | 184.72 mi (297.28 km) |
| Neu Isenburg to Oudenaarde | 231.03 mi (371.81 km) |
| Neu Isenburg to Oudenburg | 261.79 mi (421.31 km) |
| Neu Isenburg to Oupeye | 142.15 mi (228.77 km) |
| Neu Isenburg to Overijse | 190.28 mi (306.23 km) |
| Neu Isenburg to Overpelt | 164.91 mi (265.40 km) |
| Neu Isenburg to Paal | 169.26 mi (272.39 km) |
| Neu Isenburg to Peer | 160.84 mi (258.84 km) |
| Neu Isenburg to Pepinster | 132.13 mi (212.65 km) |
| Neu Isenburg to Peruwelz | 228.14 mi (367.16 km) |
| Neu Isenburg to Perwez | 175.84 mi (282.98 km) |
| Neu Isenburg to Philippeville | 184.10 mi (296.28 km) |
