| Preakness to Nuth | 3,718.03 mi (5,983.59 km) |
| Preakness to Oegstgeest | 3,628.92 mi (5,840.18 km) |
| Preakness to Oirschot | 3,679.33 mi (5,921.31 km) |
| Preakness to Oisterwijk | 3,673.19 mi (5,911.43 km) |
| Preakness to Oldebroek | 3,678.57 mi (5,920.09 km) |
| Preakness to Oldenzaal | 3,722.41 mi (5,990.64 km) |
| Preakness to Ommen | 3,697.03 mi (5,949.80 km) |
| Preakness to Oosterend | 3,670.97 mi (5,907.86 km) |
| Preakness to Oosterhout | 3,657.99 mi (5,886.96 km) |
| Preakness to Oosterwolde | 3,680.01 mi (5,922.41 km) |
| Preakness to Oostzaan | 3,639.13 mi (5,856.62 km) |
| Preakness to Opmeer | 3,635.13 mi (5,850.18 km) |
| Preakness to Oss | 3,681.05 mi (5,924.07 km) |
| Preakness to Oud-Beijerland | 3,635.40 mi (5,850.62 km) |
| Preakness to Oudenbosch | 3,646.07 mi (5,867.78 km) |
