| Neckargemund to Opwijk | 231.22 mi (372.11 km) |
| Neckargemund to Ostend | 288.50 mi (464.29 km) |
| Neckargemund to Oud-Heverlee | 208.26 mi (335.16 km) |
| Neckargemund to Oud-Turnhout | 214.25 mi (344.80 km) |
| Neckargemund to Oudenaarde | 251.19 mi (404.26 km) |
| Neckargemund to Oudenburg | 284.12 mi (457.25 km) |
| Neckargemund to Oupeye | 166.81 mi (268.45 km) |
| Neckargemund to Overijse | 211.97 mi (341.13 km) |
| Neckargemund to Overpelt | 195.21 mi (314.16 km) |
| Neckargemund to Paal | 196.44 mi (316.15 km) |
| Neckargemund to Peer | 190.36 mi (306.35 km) |
| Neckargemund to Pepinster | 155.24 mi (249.84 km) |
| Neckargemund to Peruwelz | 244.36 mi (393.27 km) |
| Neckargemund to Perwez | 196.17 mi (315.71 km) |
| Neckargemund to Philippeville | 197.42 mi (317.72 km) |
