| Castalla to Nuth | 909.04 mi (1,462.97 km) |
| Castalla to Oegstgeest | 970.65 mi (1,562.12 km) |
| Castalla to Oirschot | 937.18 mi (1,508.24 km) |
| Castalla to Oisterwijk | 941.11 mi (1,514.57 km) |
| Castalla to Oldebroek | 1,007.60 mi (1,621.58 km) |
| Castalla to Oldenzaal | 1,015.71 mi (1,634.64 km) |
| Castalla to Ommen | 1,019.86 mi (1,641.31 km) |
| Castalla to Oosterend | 1,045.84 mi (1,683.12 km) |
| Castalla to Oosterhout | 940.15 mi (1,513.03 km) |
| Castalla to Oosterwolde | 1,048.32 mi (1,687.11 km) |
| Castalla to Oostzaan | 992.37 mi (1,597.06 km) |
| Castalla to Opmeer | 1,010.78 mi (1,626.69 km) |
| Castalla to Oss | 957.69 mi (1,541.25 km) |
| Castalla to Oud-Beijerland | 945.59 mi (1,521.78 km) |
| Castalla to Oudenbosch | 932.16 mi (1,500.17 km) |
