| Oak Forest to Opwijk | 4,146.19 mi (6,672.65 km) |
| Oak Forest to Ostend | 4,089.73 mi (6,581.78 km) |
| Oak Forest to Oud-Heverlee | 4,169.01 mi (6,709.38 km) |
| Oak Forest to Oud-Turnhout | 4,163.79 mi (6,700.97 km) |
| Oak Forest to Oudenaarde | 4,128.29 mi (6,643.84 km) |
| Oak Forest to Oudenburg | 4,094.21 mi (6,588.99 km) |
| Oak Forest to Oupeye | 4,210.02 mi (6,775.38 km) |
| Oak Forest to Overijse | 4,165.77 mi (6,704.16 km) |
| Oak Forest to Overpelt | 4,183.42 mi (6,732.56 km) |
| Oak Forest to Paal | 4,180.65 mi (6,728.11 km) |
| Oak Forest to Peer | 4,187.77 mi (6,739.57 km) |
| Oak Forest to Pepinster | 4,221.62 mi (6,794.04 km) |
| Oak Forest to Peruwelz | 4,139.22 mi (6,661.44 km) |
| Oak Forest to Perwez | 4,181.99 mi (6,730.26 km) |
| Oak Forest to Philippeville | 4,187.04 mi (6,738.39 km) |
