| Harnes to Obernburg am Main | 279.18 mi (449.29 km) |
| Harnes to Obernkirchen | 295.98 mi (476.33 km) |
| Harnes to Oberschleissheim | 417.99 mi (672.70 km) |
| Harnes to Oberstdorf | 394.72 mi (635.23 km) |
| Harnes to Obertraubling | 425.94 mi (685.49 km) |
| Harnes to Obertshausen | 263.08 mi (423.39 km) |
| Harnes to Oberursel | 250.66 mi (403.40 km) |
| Harnes to Ochsenfurt | 322.30 mi (518.69 km) |
| Harnes to Ochsenhausen | 357.18 mi (574.83 km) |
| Harnes to Ochtrup | 221.34 mi (356.22 km) |
| Harnes to Odenthal | 188.53 mi (303.41 km) |
| Harnes to Oelde | 246.68 mi (396.99 km) |
| Harnes to Oelsnitz | 407.34 mi (655.55 km) |
| Harnes to Oer-Erkenschwick | 206.04 mi (331.59 km) |
| Harnes to Oerlinghausen | 270.54 mi (435.40 km) |
