| Reggio Emilia to Oberkirch | 291.15 mi (468.56 km) |
| Reggio Emilia to Obernburg am Main | 361.94 mi (582.49 km) |
| Reggio Emilia to Obernkirchen | 527.34 mi (848.68 km) |
| Reggio Emilia to Oberschleissheim | 249.26 mi (401.15 km) |
| Reggio Emilia to Oberstdorf | 187.99 mi (302.54 km) |
| Reggio Emilia to Obertraubling | 303.50 mi (488.44 km) |
| Reggio Emilia to Obertshausen | 380.21 mi (611.89 km) |
| Reggio Emilia to Oberursel | 392.15 mi (631.10 km) |
| Reggio Emilia to Ochsenfurt | 343.04 mi (552.07 km) |
| Reggio Emilia to Ochsenhausen | 235.27 mi (378.63 km) |
| Reggio Emilia to Ochtrup | 541.89 mi (872.09 km) |
| Reggio Emilia to Odenthal | 466.82 mi (751.28 km) |
| Reggio Emilia to Oelde | 505.84 mi (814.08 km) |
| Reggio Emilia to Oelsnitz | 401.38 mi (645.96 km) |
| Reggio Emilia to Oer-Erkenschwick | 504.20 mi (811.44 km) |
