| Niles to Opwijk | 4,128.31 mi (6,643.88 km) |
| Niles to Ostend | 4,071.93 mi (6,553.14 km) |
| Niles to Oud-Heverlee | 4,151.12 mi (6,680.58 km) |
| Niles to Oud-Turnhout | 4,145.65 mi (6,671.78 km) |
| Niles to Oudenaarde | 4,110.55 mi (6,615.29 km) |
| Niles to Oudenburg | 4,076.42 mi (6,560.37 km) |
| Niles to Oupeye | 4,192.03 mi (6,746.42 km) |
| Niles to Overijse | 4,147.91 mi (6,675.42 km) |
| Niles to Overpelt | 4,165.26 mi (6,703.33 km) |
| Niles to Paal | 4,162.60 mi (6,699.06 km) |
| Niles to Peer | 4,169.64 mi (6,710.39 km) |
| Niles to Pepinster | 4,203.65 mi (6,765.13 km) |
| Niles to Peruwelz | 4,121.62 mi (6,633.11 km) |
| Niles to Perwez | 4,164.15 mi (6,701.56 km) |
| Niles to Philippeville | 4,169.42 mi (6,710.03 km) |
