| Harlingen to Opwijk | 161.37 mi (259.70 km) |
| Harlingen to Ostend | 171.41 mi (275.86 km) |
| Harlingen to Oud-Heverlee | 164.90 mi (265.38 km) |
| Harlingen to Oud-Turnhout | 129.67 mi (208.68 km) |
| Harlingen to Oudenaarde | 178.35 mi (287.02 km) |
| Harlingen to Oudenburg | 171.69 mi (276.31 km) |
| Harlingen to Oupeye | 170.58 mi (274.53 km) |
| Harlingen to Overijse | 169.47 mi (272.74 km) |
| Harlingen to Overpelt | 135.21 mi (217.60 km) |
| Harlingen to Paal | 147.87 mi (237.97 km) |
| Harlingen to Peer | 141.01 mi (226.93 km) |
| Harlingen to Pepinster | 180.88 mi (291.10 km) |
| Harlingen to Peruwelz | 199.72 mi (321.42 km) |
| Harlingen to Perwez | 178.07 mi (286.58 km) |
| Harlingen to Philippeville | 208.86 mi (336.13 km) |
