| Castrovillari to Oegstgeest | 1,020.51 mi (1,642.36 km) |
| Castrovillari to Oirschot | 961.40 mi (1,547.23 km) |
| Castrovillari to Oisterwijk | 968.59 mi (1,558.79 km) |
| Castrovillari to Oldebroek | 1,000.30 mi (1,609.82 km) |
| Castrovillari to Oldenzaal | 969.39 mi (1,560.08 km) |
| Castrovillari to Ommen | 992.49 mi (1,597.26 km) |
| Castrovillari to Oosterend | 1,028.80 mi (1,655.70 km) |
| Castrovillari to Oosterhout | 980.85 mi (1,578.52 km) |
| Castrovillari to Oosterwolde | 1,023.14 mi (1,646.59 km) |
| Castrovillari to Oostzaan | 1,023.74 mi (1,647.55 km) |
| Castrovillari to Opmeer | 1,037.06 mi (1,668.99 km) |
| Castrovillari to Oss | 970.68 mi (1,562.15 km) |
| Castrovillari to Oud-Beijerland | 1,002.39 mi (1,613.20 km) |
| Castrovillari to Oudenbosch | 986.83 mi (1,588.16 km) |
| Castrovillari to Oudewater | 1,001.05 mi (1,611.04 km) |
