| Blackburn to Oberkirch | 581.73 mi (936.20 km) |
| Blackburn to Obernburg am Main | 564.40 mi (908.31 km) |
| Blackburn to Obernkirchen | 492.40 mi (792.45 km) |
| Blackburn to Oberschleissheim | 717.46 mi (1,154.64 km) |
| Blackburn to Oberstdorf | 709.06 mi (1,141.12 km) |
| Blackburn to Obertraubling | 711.35 mi (1,144.80 km) |
| Blackburn to Obertshausen | 544.42 mi (876.16 km) |
| Blackburn to Oberursel | 529.79 mi (852.62 km) |
| Blackburn to Ochsenfurt | 606.24 mi (975.64 km) |
| Blackburn to Ochsenhausen | 667.10 mi (1,073.59 km) |
| Blackburn to Ochtrup | 415.91 mi (669.34 km) |
| Blackburn to Odenthal | 445.61 mi (717.14 km) |
| Blackburn to Oelde | 463.00 mi (745.13 km) |
| Blackburn to Oelsnitz | 661.72 mi (1,064.94 km) |
| Blackburn to Oer-Erkenschwick | 432.32 mi (695.76 km) |
