| Kardzhali to Obernburg am Main | 962.20 mi (1,548.50 km) |
| Kardzhali to Obernkirchen | 1,056.24 mi (1,699.86 km) |
| Kardzhali to Oberschleissheim | 812.53 mi (1,307.64 km) |
| Kardzhali to Oberstdorf | 840.98 mi (1,353.42 km) |
| Kardzhali to Obertraubling | 814.69 mi (1,311.12 km) |
| Kardzhali to Obertshausen | 981.88 mi (1,580.18 km) |
| Kardzhali to Oberursel | 996.43 mi (1,603.60 km) |
| Kardzhali to Ochsenfurt | 919.93 mi (1,480.49 km) |
| Kardzhali to Ochsenhausen | 873.51 mi (1,405.78 km) |
| Kardzhali to Ochtrup | 1,120.25 mi (1,802.86 km) |
| Kardzhali to Odenthal | 1,080.49 mi (1,738.88 km) |
| Kardzhali to Oelde | 1,072.03 mi (1,725.26 km) |
| Kardzhali to Oelsnitz | 873.83 mi (1,406.29 km) |
| Kardzhali to Oer-Erkenschwick | 1,097.08 mi (1,765.58 km) |
| Kardzhali to Oerlinghausen | 1,059.26 mi (1,704.71 km) |
