| Castro Daire to Nuth | 956.23 mi (1,538.90 km) |
| Castro Daire to Oegstgeest | 974.40 mi (1,568.14 km) |
| Castro Daire to Oirschot | 964.93 mi (1,552.90 km) |
| Castro Daire to Oisterwijk | 965.89 mi (1,554.45 km) |
| Castro Daire to Oldebroek | 1,029.29 mi (1,656.48 km) |
| Castro Daire to Oldenzaal | 1,054.28 mi (1,696.70 km) |
| Castro Daire to Ommen | 1,047.96 mi (1,686.53 km) |
| Castro Daire to Oosterend | 1,061.58 mi (1,708.45 km) |
| Castro Daire to Oosterhout | 958.45 mi (1,542.48 km) |
| Castro Daire to Oosterwolde | 1,067.41 mi (1,717.83 km) |
| Castro Daire to Oostzaan | 999.01 mi (1,607.75 km) |
| Castro Daire to Opmeer | 1,014.59 mi (1,632.83 km) |
| Castro Daire to Oss | 984.45 mi (1,584.32 km) |
| Castro Daire to Oud-Beijerland | 953.72 mi (1,534.87 km) |
| Castro Daire to Oudenbosch | 945.86 mi (1,522.22 km) |
