| Helston to Oerlinghausen | 618.11 mi (994.75 km) |
| Helston to Oestrich-Winkel | 588.00 mi (946.30 km) |
| Helston to Offenburg | 604.85 mi (973.40 km) |
| Helston to Oftersheim | 619.85 mi (997.55 km) |
| Helston to Ohrdruf | 704.25 mi (1,133.38 km) |
| Helston to Ohringen | 662.56 mi (1,066.28 km) |
| Helston to Olbernhau | 818.38 mi (1,317.06 km) |
| Helston to Olching | 759.36 mi (1,222.06 km) |
| Helston to Oldenburg | 614.32 mi (988.65 km) |
| Helston to Oldenburg in Holstein | 740.91 mi (1,192.39 km) |
| Helston to Olfen | 561.72 mi (903.99 km) |
| Helston to Olpe | 577.86 mi (929.98 km) |
| Helston to Olsberg | 606.80 mi (976.55 km) |
| Helston to Oranienburg | 815.64 mi (1,312.64 km) |
| Helston to Ortenberg | 632.47 mi (1,017.86 km) |
