| Preakness to Oberkirch | 3,875.11 mi (6,236.39 km) |
| Preakness to Obernburg am Main | 3,879.43 mi (6,243.33 km) |
| Preakness to Obernkirchen | 3,808.66 mi (6,129.44 km) |
| Preakness to Oberschleissheim | 4,026.75 mi (6,480.43 km) |
| Preakness to Oberstdorf | 4,000.65 mi (6,438.42 km) |
| Preakness to Obertraubling | 4,028.10 mi (6,482.60 km) |
| Preakness to Obertshausen | 3,860.36 mi (6,212.65 km) |
| Preakness to Oberursel | 3,846.09 mi (6,189.68 km) |
| Preakness to Ochsenfurt | 3,922.34 mi (6,312.40 km) |
| Preakness to Ochsenhausen | 3,966.07 mi (6,382.77 km) |
| Preakness to Ochtrup | 3,735.40 mi (6,011.54 km) |
| Preakness to Odenthal | 3,764.22 mi (6,057.93 km) |
| Preakness to Oelde | 3,783.02 mi (6,088.19 km) |
| Preakness to Oelsnitz | 3,982.26 mi (6,408.83 km) |
| Preakness to Oer-Erkenschwick | 3,752.92 mi (6,039.74 km) |
