| Guadarrama to Nuth | 853.74 mi (1,373.97 km) |
| Guadarrama to Oegstgeest | 892.15 mi (1,435.78 km) |
| Guadarrama to Oirschot | 871.36 mi (1,402.33 km) |
| Guadarrama to Oisterwijk | 873.70 mi (1,406.09 km) |
| Guadarrama to Oldebroek | 939.99 mi (1,512.77 km) |
| Guadarrama to Oldenzaal | 957.89 mi (1,541.58 km) |
| Guadarrama to Ommen | 956.15 mi (1,538.77 km) |
| Guadarrama to Oosterend | 975.70 mi (1,570.24 km) |
| Guadarrama to Oosterhout | 869.05 mi (1,398.60 km) |
| Guadarrama to Oosterwolde | 980.11 mi (1,577.33 km) |
| Guadarrama to Oostzaan | 915.99 mi (1,474.14 km) |
| Guadarrama to Opmeer | 933.24 mi (1,501.91 km) |
| Guadarrama to Oss | 891.81 mi (1,435.24 km) |
| Guadarrama to Oud-Beijerland | 868.91 mi (1,398.38 km) |
| Guadarrama to Oudenbosch | 858.26 mi (1,381.24 km) |
