| Blackrock to Oberkirch | 701.42 mi (1,128.83 km) |
| Blackrock to Obernburg am Main | 698.33 mi (1,123.85 km) |
| Blackrock to Obernkirchen | 641.93 mi (1,033.08 km) |
| Blackrock to Oberschleissheim | 847.27 mi (1,363.54 km) |
| Blackrock to Oberstdorf | 829.09 mi (1,334.29 km) |
| Blackrock to Obertraubling | 846.97 mi (1,363.07 km) |
| Blackrock to Obertshausen | 679.23 mi (1,093.12 km) |
| Blackrock to Oberursel | 664.97 mi (1,070.17 km) |
| Blackrock to Ochsenfurt | 741.22 mi (1,192.87 km) |
| Blackrock to Ochsenhausen | 790.56 mi (1,272.28 km) |
| Blackrock to Ochtrup | 563.29 mi (906.52 km) |
| Blackrock to Odenthal | 583.82 mi (939.57 km) |
| Blackrock to Oelde | 609.14 mi (980.31 km) |
| Blackrock to Oelsnitz | 805.29 mi (1,295.99 km) |
| Blackrock to Oer-Erkenschwick | 575.78 mi (926.63 km) |
