| Humlebaek to Opwijk | 486.00 mi (782.14 km) |
| Humlebaek to Ostend | 511.27 mi (822.80 km) |
| Humlebaek to Oud-Heverlee | 479.35 mi (771.45 km) |
| Humlebaek to Oud-Turnhout | 444.95 mi (716.08 km) |
| Humlebaek to Oudenaarde | 509.02 mi (819.19 km) |
| Humlebaek to Oudenburg | 510.78 mi (822.01 km) |
| Humlebaek to Oupeye | 460.34 mi (740.85 km) |
| Humlebaek to Overijse | 485.72 mi (781.69 km) |
| Humlebaek to Overpelt | 438.24 mi (705.28 km) |
| Humlebaek to Paal | 454.43 mi (731.33 km) |
| Humlebaek to Peer | 441.78 mi (710.98 km) |
| Humlebaek to Pepinster | 464.07 mi (746.84 km) |
| Humlebaek to Peruwelz | 526.67 mi (847.60 km) |
| Humlebaek to Perwez | 486.62 mi (783.14 km) |
| Humlebaek to Philippeville | 517.02 mi (832.06 km) |
