| Blackrock to Opwijk | 467.57 mi (752.49 km) |
| Blackrock to Ostend | 410.20 mi (660.16 km) |
| Blackrock to Oud-Heverlee | 490.57 mi (789.49 km) |
| Blackrock to Oud-Turnhout | 490.44 mi (789.29 km) |
| Blackrock to Oudenaarde | 447.98 mi (720.95 km) |
| Blackrock to Oudenburg | 414.59 mi (667.21 km) |
| Blackrock to Oupeye | 532.99 mi (857.77 km) |
| Blackrock to Overijse | 486.73 mi (783.31 km) |
| Blackrock to Overpelt | 510.41 mi (821.42 km) |
| Blackrock to Paal | 505.11 mi (812.89 km) |
| Blackrock to Peer | 514.00 mi (827.20 km) |
| Blackrock to Pepinster | 543.98 mi (875.45 km) |
| Blackrock to Peruwelz | 457.90 mi (736.91 km) |
| Blackrock to Perwez | 502.59 mi (808.84 km) |
| Blackrock to Philippeville | 505.78 mi (813.97 km) |
