| Rock Island to Opwijk | 4,258.07 mi (6,852.70 km) |
| Rock Island to Ostend | 4,201.96 mi (6,762.40 km) |
| Rock Island to Oud-Heverlee | 4,280.81 mi (6,889.30 km) |
| Rock Island to Oud-Turnhout | 4,274.60 mi (6,879.31 km) |
| Rock Island to Oudenaarde | 4,240.72 mi (6,824.78 km) |
| Rock Island to Oudenburg | 4,206.46 mi (6,769.64 km) |
| Rock Island to Oupeye | 4,321.41 mi (6,954.64 km) |
| Rock Island to Overijse | 4,277.73 mi (6,884.34 km) |
| Rock Island to Overpelt | 4,294.12 mi (6,910.72 km) |
| Rock Island to Paal | 4,291.80 mi (6,906.99 km) |
| Rock Island to Peer | 4,298.59 mi (6,917.92 km) |
| Rock Island to Pepinster | 4,333.12 mi (6,973.48 km) |
| Rock Island to Peruwelz | 4,252.20 mi (6,843.26 km) |
| Rock Island to Perwez | 4,294.03 mi (6,910.57 km) |
| Rock Island to Philippeville | 4,299.92 mi (6,920.06 km) |
