| Miercurea-Ciuc to Nuth | 958.85 mi (1,543.11 km) |
| Miercurea-Ciuc to Oegstgeest | 1,037.71 mi (1,670.04 km) |
| Miercurea-Ciuc to Oirschot | 992.02 mi (1,596.50 km) |
| Miercurea-Ciuc to Oisterwijk | 997.50 mi (1,605.32 km) |
| Miercurea-Ciuc to Oldebroek | 984.50 mi (1,584.39 km) |
| Miercurea-Ciuc to Oldenzaal | 940.20 mi (1,513.10 km) |
| Miercurea-Ciuc to Ommen | 965.22 mi (1,553.37 km) |
| Miercurea-Ciuc to Oosterend | 990.04 mi (1,593.32 km) |
| Miercurea-Ciuc to Oosterhout | 1,012.77 mi (1,629.90 km) |
| Miercurea-Ciuc to Oosterwolde | 980.93 mi (1,578.65 km) |
| Miercurea-Ciuc to Oostzaan | 1,025.21 mi (1,649.91 km) |
| Miercurea-Ciuc to Opmeer | 1,027.70 mi (1,653.93 km) |
| Miercurea-Ciuc to Oss | 987.31 mi (1,588.91 km) |
| Miercurea-Ciuc to Oud-Beijerland | 1,034.51 mi (1,664.88 km) |
| Miercurea-Ciuc to Oudenbosch | 1,025.91 mi (1,651.04 km) |
