| Birsfelden to Opwijk | 282.21 mi (454.18 km) |
| Birsfelden to Ostend | 330.22 mi (531.45 km) |
| Birsfelden to Oud-Heverlee | 262.97 mi (423.21 km) |
| Birsfelden to Oud-Turnhout | 285.76 mi (459.88 km) |
| Birsfelden to Oudenaarde | 291.24 mi (468.71 km) |
| Birsfelden to Oudenburg | 325.71 mi (524.18 km) |
| Birsfelden to Oupeye | 235.63 mi (379.22 km) |
| Birsfelden to Overijse | 263.18 mi (423.55 km) |
| Birsfelden to Overpelt | 271.85 mi (437.49 km) |
| Birsfelden to Paal | 264.92 mi (426.34 km) |
| Birsfelden to Peer | 265.88 mi (427.89 km) |
| Birsfelden to Pepinster | 223.68 mi (359.97 km) |
| Birsfelden to Peruwelz | 274.53 mi (441.82 km) |
| Birsfelden to Perwez | 247.27 mi (397.94 km) |
| Birsfelden to Philippeville | 230.05 mi (370.24 km) |
