| Humlebaek to Obernburg am Main | 445.68 mi (717.25 km) |
| Humlebaek to Obernkirchen | 290.11 mi (466.88 km) |
| Humlebaek to Oberschleissheim | 534.32 mi (859.91 km) |
| Humlebaek to Oberstdorf | 598.54 mi (963.26 km) |
| Humlebaek to Obertraubling | 483.56 mi (778.22 km) |
| Humlebaek to Obertshausen | 435.06 mi (700.16 km) |
| Humlebaek to Oberursel | 430.07 mi (692.14 km) |
| Humlebaek to Ochsenfurt | 447.91 mi (720.83 km) |
| Humlebaek to Ochsenhausen | 555.87 mi (894.59 km) |
| Humlebaek to Ochtrup | 337.56 mi (543.25 km) |
| Humlebaek to Odenthal | 406.34 mi (653.95 km) |
| Humlebaek to Oelde | 336.10 mi (540.91 km) |
| Humlebaek to Oelsnitz | 383.37 mi (616.97 km) |
| Humlebaek to Oer-Erkenschwick | 367.69 mi (591.75 km) |
| Humlebaek to Oerlinghausen | 317.32 mi (510.68 km) |
