| Sinaia to Nuth | 981.30 mi (1,579.24 km) |
| Sinaia to Oegstgeest | 1,064.75 mi (1,713.54 km) |
| Sinaia to Oirschot | 1,016.72 mi (1,636.25 km) |
| Sinaia to Oisterwijk | 1,022.50 mi (1,645.55 km) |
| Sinaia to Oldebroek | 1,013.83 mi (1,631.60 km) |
| Sinaia to Oldenzaal | 969.94 mi (1,560.97 km) |
| Sinaia to Ommen | 995.32 mi (1,601.81 km) |
| Sinaia to Oosterend | 1,021.84 mi (1,644.49 km) |
| Sinaia to Oosterhout | 1,037.78 mi (1,670.15 km) |
| Sinaia to Oosterwolde | 1,012.89 mi (1,630.09 km) |
| Sinaia to Oostzaan | 1,053.60 mi (1,695.61 km) |
| Sinaia to Opmeer | 1,057.25 mi (1,701.49 km) |
| Sinaia to Oss | 1,013.35 mi (1,630.83 km) |
| Sinaia to Oud-Beijerland | 1,059.95 mi (1,705.82 km) |
| Sinaia to Oudenbosch | 1,050.45 mi (1,690.54 km) |
