| Harderwijk to Opwijk | 113.62 mi (182.85 km) |
| Harderwijk to Ostend | 138.99 mi (223.69 km) |
| Harderwijk to Oud-Heverlee | 112.45 mi (180.96 km) |
| Harderwijk to Oud-Turnhout | 76.34 mi (122.86 km) |
| Harderwijk to Oudenaarde | 135.02 mi (217.29 km) |
| Harderwijk to Oudenburg | 137.89 mi (221.91 km) |
| Harderwijk to Oupeye | 113.44 mi (182.56 km) |
| Harderwijk to Overijse | 117.82 mi (189.62 km) |
| Harderwijk to Overpelt | 78.77 mi (126.77 km) |
| Harderwijk to Paal | 92.54 mi (148.93 km) |
| Harderwijk to Peer | 84.39 mi (135.81 km) |
| Harderwijk to Pepinster | 123.51 mi (198.78 km) |
| Harderwijk to Peruwelz | 153.99 mi (247.82 km) |
| Harderwijk to Perwez | 124.13 mi (199.77 km) |
| Harderwijk to Philippeville | 155.54 mi (250.31 km) |
