| Humlebaek to Oestrich-Winkel | 452.62 mi (728.41 km) |
| Humlebaek to Offenburg | 552.79 mi (889.64 km) |
| Humlebaek to Oftersheim | 484.17 mi (779.20 km) |
| Humlebaek to Ohrdruf | 362.23 mi (582.95 km) |
| Humlebaek to Ohringen | 483.98 mi (778.89 km) |
| Humlebaek to Olbernhau | 367.32 mi (591.14 km) |
| Humlebaek to Olching | 538.67 mi (866.90 km) |
| Humlebaek to Oldenburg | 260.15 mi (418.68 km) |
| Humlebaek to Oldenburg in Holstein | 131.82 mi (212.14 km) |
| Humlebaek to Olfen | 360.26 mi (579.79 km) |
| Humlebaek to Olpe | 392.10 mi (631.03 km) |
| Humlebaek to Olsberg | 358.87 mi (577.55 km) |
| Humlebaek to Oranienburg | 223.40 mi (359.53 km) |
| Humlebaek to Ortenberg | 412.97 mi (664.62 km) |
| Humlebaek to Oschatz | 322.91 mi (519.67 km) |
