| Grottammare to Oberkirch | 473.41 mi (761.87 km) |
| Grottammare to Obernburg am Main | 523.83 mi (843.02 km) |
| Grottammare to Obernkirchen | 677.64 mi (1,090.56 km) |
| Grottammare to Oberschleissheim | 380.01 mi (611.56 km) |
| Grottammare to Oberstdorf | 351.69 mi (566.00 km) |
| Grottammare to Obertraubling | 420.86 mi (677.31 km) |
| Grottammare to Obertshausen | 544.05 mi (875.56 km) |
| Grottammare to Oberursel | 557.74 mi (897.60 km) |
| Grottammare to Ochsenfurt | 494.44 mi (795.72 km) |
| Grottammare to Ochsenhausen | 398.96 mi (642.07 km) |
| Grottammare to Ochtrup | 707.94 mi (1,139.32 km) |
| Grottammare to Odenthal | 639.66 mi (1,029.43 km) |
| Grottammare to Oelde | 666.42 mi (1,072.49 km) |
| Grottammare to Oelsnitz | 519.39 mi (835.88 km) |
| Grottammare to Oer-Erkenschwick | 672.70 mi (1,082.61 km) |
