| Miercurea-Ciuc to Oerlinghausen | 862.83 mi (1,388.60 km) |
| Miercurea-Ciuc to Oestrich-Winkel | 855.47 mi (1,376.74 km) |
| Miercurea-Ciuc to Offenburg | 846.02 mi (1,361.54 km) |
| Miercurea-Ciuc to Oftersheim | 822.72 mi (1,324.04 km) |
| Miercurea-Ciuc to Ohrdruf | 752.87 mi (1,211.63 km) |
| Miercurea-Ciuc to Ohringen | 780.20 mi (1,255.62 km) |
| Miercurea-Ciuc to Olbernhau | 642.49 mi (1,033.99 km) |
| Miercurea-Ciuc to Olching | 689.69 mi (1,109.95 km) |
| Miercurea-Ciuc to Oldenburg | 910.84 mi (1,465.86 km) |
| Miercurea-Ciuc to Oldenburg in Holstein | 853.71 mi (1,373.91 km) |
| Miercurea-Ciuc to Olfen | 909.42 mi (1,463.57 km) |
| Miercurea-Ciuc to Olpe | 877.69 mi (1,412.51 km) |
| Miercurea-Ciuc to Olsberg | 856.83 mi (1,378.93 km) |
| Miercurea-Ciuc to Oranienburg | 714.11 mi (1,149.25 km) |
| Miercurea-Ciuc to Ortenberg | 814.78 mi (1,311.26 km) |
