| Herdecke to Oestrich-Winkel | 99.86 mi (160.71 km) |
| Herdecke to Offenburg | 203.89 mi (328.12 km) |
| Herdecke to Oftersheim | 149.11 mi (239.96 km) |
| Herdecke to Ohrdruf | 148.46 mi (238.92 km) |
| Herdecke to Ohringen | 177.26 mi (285.26 km) |
| Herdecke to Olbernhau | 261.24 mi (420.43 km) |
| Herdecke to Olching | 280.77 mi (451.85 km) |
| Herdecke to Oldenburg | 124.93 mi (201.05 km) |
| Herdecke to Oldenburg in Holstein | 246.66 mi (396.96 km) |
| Herdecke to Olfen | 21.99 mi (35.38 km) |
| Herdecke to Olpe | 31.64 mi (50.92 km) |
| Herdecke to Olsberg | 45.42 mi (73.09 km) |
| Herdecke to Oranienburg | 263.52 mi (424.10 km) |
| Herdecke to Ortenberg | 101.02 mi (162.57 km) |
| Herdecke to Oschatz | 244.88 mi (394.10 km) |
