| Preakness to Opwijk | 3,648.22 mi (5,871.24 km) |
| Preakness to Ostend | 3,590.62 mi (5,778.54 km) |
| Preakness to Oud-Heverlee | 3,671.20 mi (5,908.22 km) |
| Preakness to Oud-Turnhout | 3,671.41 mi (5,908.57 km) |
| Preakness to Oudenaarde | 3,627.55 mi (5,837.98 km) |
| Preakness to Oudenburg | 3,594.92 mi (5,785.47 km) |
| Preakness to Oupeye | 3,713.93 mi (5,976.99 km) |
| Preakness to Overijse | 3,667.10 mi (5,901.63 km) |
| Preakness to Overpelt | 3,691.37 mi (5,940.69 km) |
| Preakness to Paal | 3,686.23 mi (5,932.42 km) |
| Preakness to Peer | 3,695.05 mi (5,946.61 km) |
| Preakness to Pepinster | 3,724.74 mi (5,994.39 km) |
| Preakness to Peruwelz | 3,635.34 mi (5,850.51 km) |
| Preakness to Perwez | 3,682.67 mi (5,926.68 km) |
| Preakness to Philippeville | 3,683.05 mi (5,927.29 km) |
