| Gravelines to Obernburg am Main | 318.68 mi (512.86 km) |
| Gravelines to Obernkirchen | 312.46 mi (502.85 km) |
| Gravelines to Oberschleissheim | 462.47 mi (744.27 km) |
| Gravelines to Oberstdorf | 442.91 mi (712.80 km) |
| Gravelines to Obertraubling | 466.99 mi (751.56 km) |
| Gravelines to Obertshausen | 301.21 mi (484.75 km) |
| Gravelines to Oberursel | 287.90 mi (463.33 km) |
| Gravelines to Ochsenfurt | 362.02 mi (582.62 km) |
| Gravelines to Ochsenhausen | 404.10 mi (650.34 km) |
| Gravelines to Ochtrup | 232.99 mi (374.97 km) |
| Gravelines to Odenthal | 216.88 mi (349.03 km) |
| Gravelines to Oelde | 265.98 mi (428.05 km) |
| Gravelines to Oelsnitz | 440.74 mi (709.30 km) |
| Gravelines to Oer-Erkenschwick | 225.80 mi (363.39 km) |
| Gravelines to Oerlinghausen | 289.33 mi (465.64 km) |
