| Clay to Oberkirch | 4,715.25 mi (7,588.45 km) |
| Clay to Obernburg am Main | 4,717.05 mi (7,591.36 km) |
| Clay to Obernkirchen | 4,641.24 mi (7,469.35 km) |
| Clay to Oberschleissheim | 4,865.62 mi (7,830.45 km) |
| Clay to Oberstdorf | 4,841.24 mi (7,791.23 km) |
| Clay to Obertraubling | 4,865.48 mi (7,830.24 km) |
| Clay to Obertshausen | 4,697.76 mi (7,560.31 km) |
| Clay to Oberursel | 4,683.38 mi (7,537.17 km) |
| Clay to Ochsenfurt | 4,759.78 mi (7,660.13 km) |
| Clay to Ochsenhausen | 4,805.99 mi (7,734.49 km) |
| Clay to Ochtrup | 4,569.39 mi (7,353.72 km) |
| Clay to Odenthal | 4,600.77 mi (7,404.22 km) |
| Clay to Oelde | 4,617.26 mi (7,430.77 km) |
| Clay to Oelsnitz | 4,816.88 mi (7,752.02 km) |
| Clay to Oer-Erkenschwick | 4,588.14 mi (7,383.89 km) |
