| Harelbeke to Obernburg am Main | 266.32 mi (428.59 km) |
| Harelbeke to Obernkirchen | 267.59 mi (430.64 km) |
| Harelbeke to Oberschleissheim | 411.15 mi (661.69 km) |
| Harelbeke to Oberstdorf | 394.56 mi (634.99 km) |
| Harelbeke to Obertraubling | 414.74 mi (667.45 km) |
| Harelbeke to Obertshausen | 248.80 mi (400.40 km) |
| Harelbeke to Oberursel | 235.50 mi (379.01 km) |
| Harelbeke to Ochsenfurt | 309.66 mi (498.35 km) |
| Harelbeke to Ochsenhausen | 354.46 mi (570.44 km) |
| Harelbeke to Ochtrup | 190.91 mi (307.23 km) |
| Harelbeke to Odenthal | 166.01 mi (267.17 km) |
| Harelbeke to Oelde | 219.33 mi (352.98 km) |
| Harelbeke to Oelsnitz | 388.93 mi (625.92 km) |
| Harelbeke to Oer-Erkenschwick | 178.71 mi (287.60 km) |
| Harelbeke to Oerlinghausen | 243.06 mi (391.16 km) |
