| Erkelenz to Obernburg am Main | 151.03 mi (243.06 km) |
| Erkelenz to Obernkirchen | 145.19 mi (233.67 km) |
| Erkelenz to Oberschleissheim | 305.55 mi (491.74 km) |
| Erkelenz to Oberstdorf | 310.33 mi (499.43 km) |
| Erkelenz to Obertraubling | 297.94 mi (479.49 km) |
| Erkelenz to Obertshausen | 130.86 mi (210.60 km) |
| Erkelenz to Oberursel | 116.20 mi (187.00 km) |
| Erkelenz to Ochsenfurt | 192.64 mi (310.02 km) |
| Erkelenz to Ochsenhausen | 264.04 mi (424.93 km) |
| Erkelenz to Ochtrup | 86.11 mi (138.59 km) |
| Erkelenz to Odenthal | 34.91 mi (56.19 km) |
| Erkelenz to Oelde | 94.41 mi (151.94 km) |
| Erkelenz to Oelsnitz | 259.78 mi (418.07 km) |
| Erkelenz to Oer-Erkenschwick | 55.81 mi (89.82 km) |
| Erkelenz to Oerlinghausen | 118.02 mi (189.94 km) |
