| Frederikssund to Opwijk | 466.92 mi (751.43 km) |
| Frederikssund to Ostend | 491.72 mi (791.34 km) |
| Frederikssund to Oud-Heverlee | 460.55 mi (741.18 km) |
| Frederikssund to Oud-Turnhout | 426.00 mi (685.58 km) |
| Frederikssund to Oudenaarde | 489.79 mi (788.25 km) |
| Frederikssund to Oudenburg | 491.26 mi (790.60 km) |
| Frederikssund to Oupeye | 442.14 mi (711.56 km) |
| Frederikssund to Overijse | 466.88 mi (751.37 km) |
| Frederikssund to Overpelt | 419.56 mi (675.22 km) |
| Frederikssund to Paal | 435.74 mi (701.25 km) |
| Frederikssund to Peer | 423.18 mi (681.04 km) |
| Frederikssund to Pepinster | 446.08 mi (717.89 km) |
| Frederikssund to Peruwelz | 507.60 mi (816.90 km) |
| Frederikssund to Perwez | 468.01 mi (753.18 km) |
| Frederikssund to Philippeville | 498.52 mi (802.29 km) |
