| Black Forest to Opwijk | 4,881.09 mi (7,855.35 km) |
| Black Forest to Ostend | 4,826.99 mi (7,768.29 km) |
| Black Forest to Oud-Heverlee | 4,903.26 mi (7,891.03 km) |
| Black Forest to Oud-Turnhout | 4,892.78 mi (7,874.17 km) |
| Black Forest to Oudenaarde | 4,866.29 mi (7,831.53 km) |
| Black Forest to Oudenburg | 4,831.55 mi (7,775.63 km) |
| Black Forest to Oupeye | 4,941.66 mi (7,952.84 km) |
| Black Forest to Overijse | 4,900.92 mi (7,887.27 km) |
| Black Forest to Overpelt | 4,911.64 mi (7,904.52 km) |
| Black Forest to Paal | 4,911.29 mi (7,903.95 km) |
| Black Forest to Peer | 4,916.57 mi (7,912.45 km) |
| Black Forest to Pepinster | 4,953.78 mi (7,972.33 km) |
| Black Forest to Peruwelz | 4,880.07 mi (7,853.71 km) |
| Black Forest to Perwez | 4,917.43 mi (7,913.83 km) |
| Black Forest to Philippeville | 4,926.96 mi (7,929.18 km) |
