| Portogruaro to Opwijk | 534.03 mi (859.43 km) |
| Portogruaro to Ostend | 588.51 mi (947.11 km) |
| Portogruaro to Oud-Heverlee | 511.89 mi (823.80 km) |
| Portogruaro to Oud-Turnhout | 523.91 mi (843.15 km) |
| Portogruaro to Oudenaarde | 549.33 mi (884.06 km) |
| Portogruaro to Oudenburg | 583.96 mi (939.79 km) |
| Portogruaro to Oupeye | 474.18 mi (763.11 km) |
| Portogruaro to Overijse | 514.19 mi (827.52 km) |
| Portogruaro to Overpelt | 505.69 mi (813.83 km) |
| Portogruaro to Paal | 504.77 mi (812.35 km) |
| Portogruaro to Peer | 500.47 mi (805.42 km) |
| Portogruaro to Pepinster | 461.94 mi (743.42 km) |
| Portogruaro to Peruwelz | 536.72 mi (863.77 km) |
| Portogruaro to Perwez | 497.69 mi (800.96 km) |
| Portogruaro to Philippeville | 489.23 mi (787.34 km) |
