| Helston to Oberkirch | 610.24 mi (982.08 km) |
| Helston to Obernburg am Main | 639.70 mi (1,029.50 km) |
| Helston to Obernkirchen | 639.69 mi (1,029.48 km) |
| Helston to Oberschleissheim | 769.46 mi (1,238.33 km) |
| Helston to Oberstdorf | 730.78 mi (1,176.08 km) |
| Helston to Obertraubling | 784.02 mi (1,261.76 km) |
| Helston to Obertshausen | 624.35 mi (1,004.79 km) |
| Helston to Oberursel | 612.19 mi (985.23 km) |
| Helston to Ochsenfurt | 682.41 mi (1,098.24 km) |
| Helston to Ochsenhausen | 701.43 mi (1,128.84 km) |
| Helston to Ochtrup | 558.47 mi (898.78 km) |
| Helston to Odenthal | 546.76 mi (879.93 km) |
| Helston to Oelde | 595.19 mi (957.86 km) |
| Helston to Oelsnitz | 768.78 mi (1,237.23 km) |
| Helston to Oer-Erkenschwick | 555.51 mi (894.00 km) |
