| Miercurea-Ciuc to Oberkirch | 839.44 mi (1,350.95 km) |
| Miercurea-Ciuc to Obernburg am Main | 803.52 mi (1,293.15 km) |
| Miercurea-Ciuc to Obernkirchen | 852.35 mi (1,371.73 km) |
| Miercurea-Ciuc to Oberschleissheim | 678.57 mi (1,092.05 km) |
| Miercurea-Ciuc to Oberstdorf | 735.37 mi (1,183.46 km) |
| Miercurea-Ciuc to Obertraubling | 658.51 mi (1,059.77 km) |
| Miercurea-Ciuc to Obertshausen | 820.04 mi (1,319.72 km) |
| Miercurea-Ciuc to Oberursel | 833.08 mi (1,340.72 km) |
| Miercurea-Ciuc to Ochsenfurt | 760.45 mi (1,223.82 km) |
| Miercurea-Ciuc to Ochsenhausen | 751.99 mi (1,210.21 km) |
| Miercurea-Ciuc to Ochtrup | 927.46 mi (1,492.60 km) |
| Miercurea-Ciuc to Odenthal | 908.19 mi (1,461.59 km) |
| Miercurea-Ciuc to Oelde | 880.61 mi (1,417.21 km) |
| Miercurea-Ciuc to Oelsnitz | 684.23 mi (1,101.16 km) |
| Miercurea-Ciuc to Oer-Erkenschwick | 913.40 mi (1,469.98 km) |
