| Heiloo to Oberkirch | 317.38 mi (510.77 km) |
| Heiloo to Obernburg am Main | 270.15 mi (434.76 km) |
| Heiloo to Obernkirchen | 186.79 mi (300.62 km) |
| Heiloo to Oberschleissheim | 425.38 mi (684.59 km) |
| Heiloo to Oberstdorf | 435.17 mi (700.34 km) |
| Heiloo to Obertraubling | 410.72 mi (660.99 km) |
| Heiloo to Obertshausen | 249.36 mi (401.30 km) |
| Heiloo to Oberursel | 234.69 mi (377.69 km) |
| Heiloo to Ochsenfurt | 308.67 mi (496.76 km) |
| Heiloo to Ochsenhausen | 388.49 mi (625.22 km) |
| Heiloo to Ochtrup | 107.77 mi (173.44 km) |
| Heiloo to Odenthal | 149.07 mi (239.90 km) |
| Heiloo to Oelde | 154.67 mi (248.92 km) |
| Heiloo to Oelsnitz | 353.89 mi (569.53 km) |
| Heiloo to Oer-Erkenschwick | 126.23 mi (203.15 km) |
