| Olhao to Opwijk | 1,130.32 mi (1,819.07 km) |
| Olhao to Ostend | 1,114.17 mi (1,793.09 km) |
| Olhao to Oud-Heverlee | 1,135.61 mi (1,827.59 km) |
| Olhao to Oud-Turnhout | 1,170.46 mi (1,883.68 km) |
| Olhao to Oudenaarde | 1,108.98 mi (1,784.73 km) |
| Olhao to Oudenburg | 1,113.58 mi (1,792.14 km) |
| Olhao to Oupeye | 1,155.74 mi (1,859.98 km) |
| Olhao to Overijse | 1,129.32 mi (1,817.47 km) |
| Olhao to Overpelt | 1,176.58 mi (1,893.52 km) |
| Olhao to Paal | 1,160.40 mi (1,867.48 km) |
| Olhao to Peer | 1,173.07 mi (1,887.87 km) |
| Olhao to Pepinster | 1,153.27 mi (1,856.02 km) |
| Olhao to Peruwelz | 1,089.75 mi (1,753.79 km) |
| Olhao to Perwez | 1,128.23 mi (1,815.71 km) |
| Olhao to Philippeville | 1,098.05 mi (1,767.14 km) |
