| Illescas to Nuth | 880.43 mi (1,416.91 km) |
| Illescas to Oegstgeest | 922.12 mi (1,484.00 km) |
| Illescas to Oirschot | 899.57 mi (1,447.71 km) |
| Illescas to Oisterwijk | 902.13 mi (1,451.83 km) |
| Illescas to Oldebroek | 968.66 mi (1,558.91 km) |
| Illescas to Oldenzaal | 985.29 mi (1,585.68 km) |
| Illescas to Ommen | 984.35 mi (1,584.15 km) |
| Illescas to Oosterend | 1,004.81 mi (1,617.09 km) |
| Illescas to Oosterhout | 897.96 mi (1,445.12 km) |
| Illescas to Oosterwolde | 1,008.98 mi (1,623.79 km) |
| Illescas to Oostzaan | 945.75 mi (1,522.04 km) |
| Illescas to Opmeer | 963.21 mi (1,550.13 km) |
| Illescas to Oss | 920.10 mi (1,480.75 km) |
| Illescas to Oud-Beijerland | 898.56 mi (1,446.09 km) |
| Illescas to Oudenbosch | 887.50 mi (1,428.30 km) |
