| Olesa de Montserrat to Opwijk | 660.01 mi (1,062.18 km) |
| Olesa de Montserrat to Ostend | 670.64 mi (1,079.29 km) |
| Olesa de Montserrat to Oud-Heverlee | 655.19 mi (1,054.43 km) |
| Olesa de Montserrat to Oud-Turnhout | 690.83 mi (1,111.79 km) |
| Olesa de Montserrat to Oudenaarde | 648.02 mi (1,042.89 km) |
| Olesa de Montserrat to Oudenburg | 668.00 mi (1,075.05 km) |
| Olesa de Montserrat to Oupeye | 657.85 mi (1,058.71 km) |
| Olesa de Montserrat to Overijse | 650.56 mi (1,046.98 km) |
| Olesa de Montserrat to Overpelt | 688.80 mi (1,108.52 km) |
| Olesa de Montserrat to Paal | 674.22 mi (1,085.05 km) |
| Olesa de Montserrat to Peer | 683.65 mi (1,100.22 km) |
| Olesa de Montserrat to Pepinster | 650.85 mi (1,047.44 km) |
| Olesa de Montserrat to Peruwelz | 625.11 mi (1,006.02 km) |
| Olesa de Montserrat to Perwez | 642.59 mi (1,034.15 km) |
| Olesa de Montserrat to Philippeville | 611.39 mi (983.93 km) |
