| Oberhausen-Rheinhausen to Oria | 751.81 mi (1,209.92 km) |
| Oberhausen-Rheinhausen to Oristano | 646.38 mi (1,040.24 km) |
| Oberhausen-Rheinhausen to Orta Nova | 650.13 mi (1,046.28 km) |
| Oberhausen-Rheinhausen to Orte | 505.79 mi (813.98 km) |
| Oberhausen-Rheinhausen to Ortona | 555.61 mi (894.17 km) |
| Oberhausen-Rheinhausen to Orvieto | 484.23 mi (779.29 km) |
| Oberhausen-Rheinhausen to Orzinuovi | 275.21 mi (442.91 km) |
| Oberhausen-Rheinhausen to Osimo | 464.64 mi (747.77 km) |
| Oberhausen-Rheinhausen to Ospitaletto | 266.55 mi (428.97 km) |
| Oberhausen-Rheinhausen to Ostuni | 736.94 mi (1,185.98 km) |
| Oberhausen-Rheinhausen to Ottaviano | 650.07 mi (1,046.18 km) |
| Oberhausen-Rheinhausen to Ovada | 319.40 mi (514.02 km) |
| Oberhausen-Rheinhausen to Ozieri | 599.96 mi (965.55 km) |
| Oberhausen-Rheinhausen to Paceco | 804.96 mi (1,295.46 km) |
| Oberhausen-Rheinhausen to Pachino | 928.05 mi (1,493.55 km) |
