| Black Forest to Oberkirch | 5,122.58 mi (8,244.00 km) |
| Black Forest to Obernburg am Main | 5,097.52 mi (8,203.67 km) |
| Black Forest to Obernkirchen | 4,984.57 mi (8,021.89 km) |
| Black Forest to Oberschleissheim | 5,252.78 mi (8,453.53 km) |
| Black Forest to Oberstdorf | 5,249.87 mi (8,448.85 km) |
| Black Forest to Obertraubling | 5,237.90 mi (8,429.59 km) |
| Black Forest to Obertshausen | 5,076.86 mi (8,170.41 km) |
| Black Forest to Oberursel | 5,062.10 mi (8,146.67 km) |
| Black Forest to Ochsenfurt | 5,136.82 mi (8,266.91 km) |
| Black Forest to Ochsenhausen | 5,207.28 mi (8,380.30 km) |
| Black Forest to Ochtrup | 4,925.86 mi (7,927.41 km) |
| Black Forest to Odenthal | 4,976.17 mi (8,008.37 km) |
| Black Forest to Oelde | 4,973.56 mi (8,004.17 km) |
| Black Forest to Oelsnitz | 5,167.94 mi (8,316.99 km) |
| Black Forest to Oer-Erkenschwick | 4,953.13 mi (7,971.30 km) |
