| Castel Bolognese to Orzesze | 517.95 mi (833.56 km) |
| Castel Bolognese to Osowa | 759.49 mi (1,222.28 km) |
| Castel Bolognese to Ostroda | 745.43 mi (1,199.65 km) |
| Castel Bolognese to Ostroleka | 749.51 mi (1,206.23 km) |
| Castel Bolognese to Ostrow Mazowiecka | 744.77 mi (1,198.59 km) |
| Castel Bolognese to Ostrow Wielkopolski | 577.55 mi (929.48 km) |
| Castel Bolognese to Ostrowiec Swietokrzyski | 638.41 mi (1,027.43 km) |
| Castel Bolognese to Ostrzeszow | 566.52 mi (911.73 km) |
| Castel Bolognese to Oswiecim | 526.51 mi (847.33 km) |
| Castel Bolognese to Otwock | 691.92 mi (1,113.54 km) |
| Castel Bolognese to Ozarow Mazowiecki | 683.95 mi (1,100.71 km) |
| Castel Bolognese to Ozimek | 531.08 mi (854.69 km) |
| Castel Bolognese to Ozorkow | 630.46 mi (1,014.64 km) |
| Castel Bolognese to Pabianice | 615.49 mi (990.54 km) |
| Castel Bolognese to Parczew | 717.96 mi (1,155.44 km) |
