| Harsum to Obernburg am Main | 167.26 mi (269.18 km) |
| Harsum to Obernkirchen | 35.88 mi (57.75 km) |
| Harsum to Oberschleissheim | 282.35 mi (454.40 km) |
| Harsum to Oberstdorf | 331.66 mi (533.75 km) |
| Harsum to Obertraubling | 243.85 mi (392.43 km) |
| Harsum to Obertshausen | 155.63 mi (250.46 km) |
| Harsum to Oberursel | 150.73 mi (242.57 km) |
| Harsum to Ochsenfurt | 176.62 mi (284.25 km) |
| Harsum to Ochsenhausen | 285.58 mi (459.59 km) |
| Harsum to Ochtrup | 117.27 mi (188.73 km) |
| Harsum to Odenthal | 146.39 mi (235.60 km) |
| Harsum to Oelde | 81.14 mi (130.58 km) |
| Harsum to Oelsnitz | 156.05 mi (251.14 km) |
| Harsum to Oer-Erkenschwick | 121.81 mi (196.04 km) |
| Harsum to Oerlinghausen | 57.33 mi (92.27 km) |
