| Gennep to Oerlinghausen | 116.74 mi (187.87 km) |
| Gennep to Oestrich-Winkel | 147.17 mi (236.85 km) |
| Gennep to Offenburg | 239.79 mi (385.90 km) |
| Gennep to Oftersheim | 197.76 mi (318.27 km) |
| Gennep to Ohrdruf | 214.64 mi (345.43 km) |
| Gennep to Ohringen | 232.33 mi (373.89 km) |
| Gennep to Olbernhau | 326.78 mi (525.91 km) |
| Gennep to Olching | 339.02 mi (545.61 km) |
| Gennep to Oldenburg | 137.53 mi (221.34 km) |
| Gennep to Oldenburg in Holstein | 272.04 mi (437.80 km) |
| Gennep to Olfen | 60.66 mi (97.62 km) |
| Gennep to Olpe | 93.35 mi (150.23 km) |
| Gennep to Olsberg | 110.85 mi (178.39 km) |
| Gennep to Oranienburg | 316.04 mi (508.62 km) |
| Gennep to Ortenberg | 163.20 mi (262.64 km) |
