| Harwich to Oberkirch | 381.82 mi (614.47 km) |
| Harwich to Obernburg am Main | 372.27 mi (599.11 km) |
| Harwich to Obernkirchen | 333.88 mi (537.32 km) |
| Harwich to Oberschleissheim | 522.08 mi (840.20 km) |
| Harwich to Oberstdorf | 509.43 mi (819.84 km) |
| Harwich to Obertraubling | 520.94 mi (838.37 km) |
| Harwich to Obertshausen | 353.22 mi (568.45 km) |
| Harwich to Oberursel | 339.01 mi (545.59 km) |
| Harwich to Ochsenfurt | 415.18 mi (668.16 km) |
| Harwich to Ochsenhausen | 468.40 mi (753.81 km) |
| Harwich to Ochtrup | 252.24 mi (405.95 km) |
| Harwich to Odenthal | 259.24 mi (417.20 km) |
| Harwich to Oelde | 293.57 mi (472.45 km) |
| Harwich to Oelsnitz | 483.19 mi (777.62 km) |
| Harwich to Oer-Erkenschwick | 256.51 mi (412.81 km) |
