| Gelsenkirchen to Opwijk | 131.75 mi (212.03 km) |
| Gelsenkirchen to Ostend | 181.41 mi (291.96 km) |
| Gelsenkirchen to Oud-Heverlee | 115.49 mi (185.86 km) |
| Gelsenkirchen to Oud-Turnhout | 92.25 mi (148.46 km) |
| Gelsenkirchen to Oudenaarde | 158.41 mi (254.94 km) |
| Gelsenkirchen to Oudenburg | 178.40 mi (287.10 km) |
| Gelsenkirchen to Oupeye | 84.34 mi (135.73 km) |
| Gelsenkirchen to Overijse | 122.23 mi (196.71 km) |
| Gelsenkirchen to Overpelt | 75.51 mi (121.52 km) |
| Gelsenkirchen to Paal | 89.59 mi (144.18 km) |
| Gelsenkirchen to Peer | 75.87 mi (122.10 km) |
| Gelsenkirchen to Pepinster | 86.12 mi (138.59 km) |
| Gelsenkirchen to Peruwelz | 167.72 mi (269.93 km) |
| Gelsenkirchen to Perwez | 116.80 mi (187.98 km) |
| Gelsenkirchen to Philippeville | 143.67 mi (231.22 km) |
