| Castel Bolognese to Oegstgeest | 639.00 mi (1,028.37 km) |
| Castel Bolognese to Oirschot | 579.96 mi (933.35 km) |
| Castel Bolognese to Oisterwijk | 587.13 mi (944.89 km) |
| Castel Bolognese to Oldebroek | 623.27 mi (1,003.06 km) |
| Castel Bolognese to Oldenzaal | 595.92 mi (959.05 km) |
| Castel Bolognese to Ommen | 617.59 mi (993.91 km) |
| Castel Bolognese to Oosterend | 654.25 mi (1,052.92 km) |
| Castel Bolognese to Oosterhout | 598.86 mi (963.77 km) |
| Castel Bolognese to Oosterwolde | 649.42 mi (1,045.14 km) |
| Castel Bolognese to Oostzaan | 643.73 mi (1,035.99 km) |
| Castel Bolognese to Opmeer | 657.96 mi (1,058.88 km) |
| Castel Bolognese to Oss | 590.43 mi (950.20 km) |
| Castel Bolognese to Oud-Beijerland | 620.00 mi (997.79 km) |
| Castel Bolognese to Oudenbosch | 604.20 mi (972.36 km) |
| Castel Bolognese to Oudewater | 619.94 mi (997.70 km) |
