| Ercolano to Oberkirch | 616.21 mi (991.69 km) |
| Ercolano to Obernburg am Main | 673.50 mi (1,083.89 km) |
| Ercolano to Obernkirchen | 829.81 mi (1,335.46 km) |
| Ercolano to Oberschleissheim | 532.59 mi (857.12 km) |
| Ercolano to Oberstdorf | 499.17 mi (803.34 km) |
| Ercolano to Obertraubling | 574.17 mi (924.03 km) |
| Ercolano to Obertshausen | 693.41 mi (1,115.94 km) |
| Ercolano to Oberursel | 706.77 mi (1,137.43 km) |
| Ercolano to Ochsenfurt | 645.75 mi (1,039.23 km) |
| Ercolano to Ochsenhausen | 547.15 mi (880.55 km) |
| Ercolano to Ochtrup | 857.45 mi (1,379.94 km) |
| Ercolano to Odenthal | 787.01 mi (1,266.56 km) |
| Ercolano to Oelde | 816.99 mi (1,314.82 km) |
| Ercolano to Oelsnitz | 672.70 mi (1,082.60 km) |
| Ercolano to Oer-Erkenschwick | 821.47 mi (1,322.03 km) |
