| Mercogliano to Oberkirch | 618.60 mi (995.54 km) |
| Mercogliano to Obernburg am Main | 672.93 mi (1,082.97 km) |
| Mercogliano to Obernkirchen | 827.37 mi (1,331.52 km) |
| Mercogliano to Oberschleissheim | 529.69 mi (852.45 km) |
| Mercogliano to Oberstdorf | 499.59 mi (804.02 km) |
| Mercogliano to Obertraubling | 569.70 mi (916.85 km) |
| Mercogliano to Obertshausen | 693.03 mi (1,115.32 km) |
| Mercogliano to Oberursel | 706.58 mi (1,137.13 km) |
| Mercogliano to Ochsenfurt | 644.07 mi (1,036.53 km) |
| Mercogliano to Ochsenhausen | 547.29 mi (880.78 km) |
| Mercogliano to Ochtrup | 857.03 mi (1,379.26 km) |
| Mercogliano to Odenthal | 787.70 mi (1,267.69 km) |
| Mercogliano to Oelde | 815.88 mi (1,313.03 km) |
| Mercogliano to Oelsnitz | 667.52 mi (1,074.27 km) |
| Mercogliano to Oer-Erkenschwick | 821.46 mi (1,322.02 km) |
