| Reggio Emilia to Oerlinghausen | 510.09 mi (820.91 km) |
| Reggio Emilia to Oestrich-Winkel | 386.32 mi (621.72 km) |
| Reggio Emilia to Offenburg | 290.08 mi (466.83 km) |
| Reggio Emilia to Oftersheim | 336.78 mi (542.00 km) |
| Reggio Emilia to Ohrdruf | 423.44 mi (681.45 km) |
| Reggio Emilia to Ohringen | 315.47 mi (507.70 km) |
| Reggio Emilia to Olbernhau | 430.89 mi (693.45 km) |
| Reggio Emilia to Olching | 244.00 mi (392.68 km) |
| Reggio Emilia to Oldenburg | 593.57 mi (955.27 km) |
| Reggio Emilia to Oldenburg in Holstein | 663.39 mi (1,067.62 km) |
| Reggio Emilia to Olfen | 507.24 mi (816.33 km) |
| Reggio Emilia to Olpe | 455.25 mi (732.65 km) |
| Reggio Emilia to Olsberg | 470.03 mi (756.44 km) |
| Reggio Emilia to Oranienburg | 568.91 mi (915.58 km) |
| Reggio Emilia to Ortenberg | 397.63 mi (639.92 km) |
