| The Hills to Opwijk | 3,676.65 mi (5,916.99 km) |
| The Hills to Ostend | 3,619.04 mi (5,824.29 km) |
| The Hills to Oud-Heverlee | 3,699.63 mi (5,953.98 km) |
| The Hills to Oud-Turnhout | 3,699.86 mi (5,954.35 km) |
| The Hills to Oudenaarde | 3,655.97 mi (5,883.72 km) |
| The Hills to Oudenburg | 3,623.35 mi (5,831.21 km) |
| The Hills to Oupeye | 3,742.36 mi (6,022.75 km) |
| The Hills to Overijse | 3,695.53 mi (5,947.37 km) |
| The Hills to Overpelt | 3,719.82 mi (5,986.47 km) |
| The Hills to Paal | 3,714.68 mi (5,978.19 km) |
| The Hills to Peer | 3,723.50 mi (5,992.39 km) |
| The Hills to Pepinster | 3,753.17 mi (6,040.15 km) |
| The Hills to Peruwelz | 3,663.74 mi (5,896.22 km) |
| The Hills to Perwez | 3,711.09 mi (5,972.42 km) |
| The Hills to Philippeville | 3,711.45 mi (5,973.00 km) |
