| Oeiras to Opwijk | 1,072.52 mi (1,726.06 km) |
| Oeiras to Ostend | 1,050.02 mi (1,689.85 km) |
| Oeiras to Oud-Heverlee | 1,080.40 mi (1,738.73 km) |
| Oeiras to Oud-Turnhout | 1,113.93 mi (1,792.69 km) |
| Oeiras to Oudenaarde | 1,049.44 mi (1,688.92 km) |
| Oeiras to Oudenburg | 1,049.96 mi (1,689.74 km) |
| Oeiras to Oupeye | 1,104.91 mi (1,778.18 km) |
| Oeiras to Overijse | 1,073.86 mi (1,728.20 km) |
| Oeiras to Overpelt | 1,122.16 mi (1,805.94 km) |
| Oeiras to Paal | 1,106.01 mi (1,779.96 km) |
| Oeiras to Peer | 1,119.23 mi (1,801.22 km) |
| Oeiras to Pepinster | 1,103.88 mi (1,776.53 km) |
| Oeiras to Peruwelz | 1,031.88 mi (1,660.65 km) |
| Oeiras to Perwez | 1,074.72 mi (1,729.60 km) |
| Oeiras to Philippeville | 1,045.87 mi (1,683.16 km) |
