| Ercolano to Oerlinghausen | 817.08 mi (1,314.97 km) |
| Ercolano to Oestrich-Winkel | 705.75 mi (1,135.79 km) |
| Ercolano to Offenburg | 616.04 mi (991.42 km) |
| Ercolano to Oftersheim | 655.09 mi (1,054.26 km) |
| Ercolano to Ohrdruf | 714.21 mi (1,149.40 km) |
| Ercolano to Ohringen | 626.56 mi (1,008.34 km) |
| Ercolano to Olbernhau | 683.47 mi (1,099.93 km) |
| Ercolano to Olching | 532.58 mi (857.10 km) |
| Ercolano to Oldenburg | 899.78 mi (1,448.06 km) |
| Ercolano to Oldenburg in Holstein | 946.37 mi (1,523.04 km) |
| Ercolano to Olfen | 823.52 mi (1,325.32 km) |
| Ercolano to Olpe | 771.56 mi (1,241.71 km) |
| Ercolano to Olsberg | 780.66 mi (1,256.35 km) |
| Ercolano to Oranienburg | 827.62 mi (1,331.93 km) |
| Ercolano to Ortenberg | 707.70 mi (1,138.93 km) |
