| Castrolibero to Oegstgeest | 1,050.78 mi (1,691.06 km) |
| Castrolibero to Oirschot | 991.67 mi (1,595.94 km) |
| Castrolibero to Oisterwijk | 998.85 mi (1,607.50 km) |
| Castrolibero to Oldebroek | 1,031.49 mi (1,660.03 km) |
| Castrolibero to Oldenzaal | 1,001.06 mi (1,611.04 km) |
| Castrolibero to Ommen | 1,023.99 mi (1,647.95 km) |
| Castrolibero to Oosterend | 1,060.38 mi (1,706.51 km) |
| Castrolibero to Oosterhout | 1,010.95 mi (1,626.97 km) |
| Castrolibero to Oosterwolde | 1,054.81 mi (1,697.56 km) |
| Castrolibero to Oostzaan | 1,054.39 mi (1,696.88 km) |
| Castrolibero to Opmeer | 1,067.91 mi (1,718.64 km) |
| Castrolibero to Oss | 1,001.25 mi (1,611.36 km) |
| Castrolibero to Oud-Beijerland | 1,032.36 mi (1,661.43 km) |
| Castrolibero to Oudenbosch | 1,016.71 mi (1,636.23 km) |
| Castrolibero to Oudewater | 1,031.43 mi (1,659.92 km) |
