| Comacchio to Opwijk | 569.56 mi (916.61 km) |
| Comacchio to Ostend | 621.17 mi (999.67 km) |
| Comacchio to Oud-Heverlee | 548.45 mi (882.65 km) |
| Comacchio to Oud-Turnhout | 564.90 mi (909.12 km) |
| Comacchio to Oudenaarde | 581.84 mi (936.38 km) |
| Comacchio to Oudenburg | 616.61 mi (992.34 km) |
| Comacchio to Oupeye | 514.16 mi (827.47 km) |
| Comacchio to Overijse | 549.87 mi (884.93 km) |
| Comacchio to Overpelt | 547.91 mi (881.77 km) |
| Comacchio to Paal | 544.84 mi (876.83 km) |
| Comacchio to Peer | 542.33 mi (872.80 km) |
| Comacchio to Pepinster | 501.77 mi (807.52 km) |
| Comacchio to Peruwelz | 566.75 mi (912.10 km) |
| Comacchio to Perwez | 533.42 mi (858.45 km) |
| Comacchio to Philippeville | 520.64 mi (837.88 km) |
