| Calera to Oberkirch | 4,748.55 mi (7,642.05 km) |
| Calera to Obernburg am Main | 4,750.97 mi (7,645.94 km) |
| Calera to Obernkirchen | 4,676.00 mi (7,525.29 km) |
| Calera to Oberschleissheim | 4,899.26 mi (7,884.60 km) |
| Calera to Oberstdorf | 4,874.41 mi (7,844.61 km) |
| Calera to Obertraubling | 4,899.46 mi (7,884.91 km) |
| Calera to Obertshausen | 4,731.72 mi (7,614.96 km) |
| Calera to Oberursel | 4,717.36 mi (7,591.85 km) |
| Calera to Ochsenfurt | 4,793.74 mi (7,714.77 km) |
| Calera to Ochsenhausen | 4,839.36 mi (7,788.20 km) |
| Calera to Ochtrup | 4,603.94 mi (7,409.32 km) |
| Calera to Odenthal | 4,634.89 mi (7,459.13 km) |
| Calera to Oelde | 4,651.78 mi (7,486.31 km) |
| Calera to Oelsnitz | 4,851.35 mi (7,807.49 km) |
| Calera to Oer-Erkenschwick | 4,622.49 mi (7,439.18 km) |
