| Heerlerbaan to Oberkirch | 186.07 mi (299.46 km) |
| Heerlerbaan to Obernburg am Main | 155.25 mi (249.86 km) |
| Heerlerbaan to Obernkirchen | 164.69 mi (265.04 km) |
| Heerlerbaan to Oberschleissheim | 307.70 mi (495.20 km) |
| Heerlerbaan to Oberstdorf | 307.09 mi (494.21 km) |
| Heerlerbaan to Obertraubling | 303.71 mi (488.77 km) |
| Heerlerbaan to Obertshausen | 135.96 mi (218.80 km) |
| Heerlerbaan to Oberursel | 121.73 mi (195.91 km) |
| Heerlerbaan to Ochsenfurt | 197.96 mi (318.58 km) |
| Heerlerbaan to Ochsenhausen | 261.86 mi (421.42 km) |
| Heerlerbaan to Ochtrup | 105.34 mi (169.53 km) |
| Heerlerbaan to Odenthal | 49.47 mi (79.62 km) |
| Heerlerbaan to Oelde | 113.85 mi (183.22 km) |
| Heerlerbaan to Oelsnitz | 271.47 mi (436.89 km) |
| Heerlerbaan to Oer-Erkenschwick | 75.69 mi (121.82 km) |
