| Erkelenz to Oestrich-Winkel | 105.19 mi (169.28 km) |
| Erkelenz to Offenburg | 194.64 mi (313.24 km) |
| Erkelenz to Oftersheim | 155.08 mi (249.57 km) |
| Erkelenz to Ohrdruf | 192.98 mi (310.57 km) |
| Erkelenz to Ohringen | 191.81 mi (308.68 km) |
| Erkelenz to Olbernhau | 307.15 mi (494.31 km) |
| Erkelenz to Olching | 299.44 mi (481.89 km) |
| Erkelenz to Oldenburg | 163.54 mi (263.19 km) |
| Erkelenz to Oldenburg in Holstein | 293.08 mi (471.67 km) |
| Erkelenz to Olfen | 63.47 mi (102.15 km) |
| Erkelenz to Olpe | 66.03 mi (106.27 km) |
| Erkelenz to Olsberg | 95.56 mi (153.78 km) |
| Erkelenz to Oranienburg | 316.54 mi (509.43 km) |
| Erkelenz to Ortenberg | 129.91 mi (209.06 km) |
| Erkelenz to Oschatz | 294.32 mi (473.66 km) |
