| Opalenica to Opwijk | 531.91 mi (856.03 km) |
| Opalenica to Ostend | 580.96 mi (934.96 km) |
| Opalenica to Oud-Heverlee | 514.04 mi (827.27 km) |
| Opalenica to Oud-Turnhout | 492.51 mi (792.61 km) |
| Opalenica to Oudenaarde | 558.55 mi (898.89 km) |
| Opalenica to Oudenburg | 578.21 mi (930.53 km) |
| Opalenica to Oupeye | 475.69 mi (765.54 km) |
| Opalenica to Overijse | 520.60 mi (837.82 km) |
| Opalenica to Overpelt | 475.79 mi (765.71 km) |
| Opalenica to Paal | 489.03 mi (787.01 km) |
| Opalenica to Peer | 475.62 mi (765.43 km) |
| Opalenica to Pepinster | 471.52 mi (758.84 km) |
| Opalenica to Peruwelz | 565.78 mi (910.53 km) |
| Opalenica to Perwez | 512.01 mi (824.00 km) |
| Opalenica to Philippeville | 532.60 mi (857.14 km) |
