| Horb am Neckar to Opwijk | 266.22 mi (428.45 km) |
| Horb am Neckar to Ostend | 320.88 mi (516.41 km) |
| Horb am Neckar to Oud-Heverlee | 244.17 mi (392.95 km) |
| Horb am Neckar to Oud-Turnhout | 258.02 mi (415.25 km) |
| Horb am Neckar to Oudenaarde | 281.82 mi (453.54 km) |
| Horb am Neckar to Oudenburg | 316.34 mi (509.10 km) |
| Horb am Neckar to Oupeye | 207.56 mi (334.03 km) |
| Horb am Neckar to Overijse | 246.39 mi (396.53 km) |
| Horb am Neckar to Overpelt | 240.70 mi (387.38 km) |
| Horb am Neckar to Paal | 238.27 mi (383.46 km) |
| Horb am Neckar to Peer | 235.19 mi (378.50 km) |
| Horb am Neckar to Pepinster | 195.20 mi (314.15 km) |
| Horb am Neckar to Peruwelz | 270.20 mi (434.84 km) |
| Horb am Neckar to Perwez | 229.88 mi (369.96 km) |
| Horb am Neckar to Philippeville | 222.39 mi (357.90 km) |
