| Piedmont to Oberkirch | 5,737.81 mi (9,234.12 km) |
| Piedmont to Obernburg am Main | 5,694.54 mi (9,164.47 km) |
| Piedmont to Obernkirchen | 5,559.75 mi (8,947.56 km) |
| Piedmont to Oberschleissheim | 5,847.89 mi (9,411.26 km) |
| Piedmont to Oberstdorf | 5,860.67 mi (9,431.84 km) |
| Piedmont to Obertraubling | 5,822.88 mi (9,371.01 km) |
| Piedmont to Obertshausen | 5,673.79 mi (9,131.08 km) |
| Piedmont to Oberursel | 5,659.41 mi (9,107.95 km) |
| Piedmont to Ochsenfurt | 5,729.62 mi (9,220.93 km) |
| Piedmont to Ochsenhausen | 5,814.58 mi (9,357.66 km) |
| Piedmont to Ochtrup | 5,513.27 mi (8,872.75 km) |
| Piedmont to Odenthal | 5,574.90 mi (8,971.93 km) |
| Piedmont to Oelde | 5,558.65 mi (8,945.79 km) |
| Piedmont to Oelsnitz | 5,740.35 mi (9,238.21 km) |
| Piedmont to Oer-Erkenschwick | 5,545.43 mi (8,924.51 km) |
