| Ilsenburg to Opwijk | 286.80 mi (461.56 km) |
| Ilsenburg to Ostend | 336.36 mi (541.32 km) |
| Ilsenburg to Oud-Heverlee | 269.18 mi (433.21 km) |
| Ilsenburg to Oud-Turnhout | 247.54 mi (398.38 km) |
| Ilsenburg to Oudenaarde | 313.44 mi (504.44 km) |
| Ilsenburg to Oudenburg | 333.49 mi (536.69 km) |
| Ilsenburg to Oupeye | 231.98 mi (373.33 km) |
| Ilsenburg to Overijse | 275.79 mi (443.84 km) |
| Ilsenburg to Overpelt | 230.68 mi (371.24 km) |
| Ilsenburg to Paal | 243.99 mi (392.66 km) |
| Ilsenburg to Peer | 230.53 mi (371.00 km) |
| Ilsenburg to Pepinster | 228.91 mi (368.40 km) |
| Ilsenburg to Peruwelz | 321.13 mi (516.81 km) |
| Ilsenburg to Perwez | 267.85 mi (431.06 km) |
| Ilsenburg to Philippeville | 290.19 mi (467.02 km) |
