| Cassano al Ionio to Oegstgeest | 1,025.56 mi (1,650.48 km) |
| Cassano al Ionio to Oirschot | 966.45 mi (1,555.36 km) |
| Cassano al Ionio to Oisterwijk | 973.64 mi (1,566.92 km) |
| Cassano al Ionio to Oldebroek | 1,005.08 mi (1,617.52 km) |
| Cassano al Ionio to Oldenzaal | 974.02 mi (1,567.54 km) |
| Cassano al Ionio to Ommen | 997.18 mi (1,604.80 km) |
| Cassano al Ionio to Oosterend | 1,033.47 mi (1,663.20 km) |
| Cassano al Ionio to Oosterhout | 985.94 mi (1,586.71 km) |
| Cassano al Ionio to Oosterwolde | 1,027.77 mi (1,654.03 km) |
| Cassano al Ionio to Oostzaan | 1,028.68 mi (1,655.50 km) |
| Cassano al Ionio to Opmeer | 1,041.95 mi (1,676.85 km) |
| Cassano al Ionio to Oss | 975.65 mi (1,570.15 km) |
| Cassano al Ionio to Oud-Beijerland | 1,007.52 mi (1,621.44 km) |
| Cassano al Ionio to Oudenbosch | 991.98 mi (1,596.44 km) |
| Cassano al Ionio to Oudewater | 1,006.07 mi (1,619.12 km) |
