| Huercal-Overa to Oerlinghausen | 1,131.53 mi (1,821.02 km) |
| Huercal-Overa to Oestrich-Winkel | 1,001.08 mi (1,611.08 km) |
| Huercal-Overa to Offenburg | 912.43 mi (1,468.42 km) |
| Huercal-Overa to Oftersheim | 980.24 mi (1,577.55 km) |
| Huercal-Overa to Ohrdruf | 1,118.08 mi (1,799.38 km) |
| Huercal-Overa to Ohringen | 996.19 mi (1,603.21 km) |
| Huercal-Overa to Olbernhau | 1,185.80 mi (1,908.36 km) |
| Huercal-Overa to Olching | 1,002.07 mi (1,612.68 km) |
| Huercal-Overa to Oldenburg | 1,192.79 mi (1,919.61 km) |
| Huercal-Overa to Oldenburg in Holstein | 1,316.93 mi (2,119.39 km) |
| Huercal-Overa to Olfen | 1,089.35 mi (1,753.14 km) |
| Huercal-Overa to Olpe | 1,056.80 mi (1,700.76 km) |
| Huercal-Overa to Olsberg | 1,091.10 mi (1,755.96 km) |
| Huercal-Overa to Oranienburg | 1,288.83 mi (2,074.16 km) |
| Huercal-Overa to Ortenberg | 1,047.70 mi (1,686.12 km) |
