| Castleford to Opole | 840.85 mi (1,353.21 km) |
| Castleford to Orzesze | 887.87 mi (1,428.89 km) |
| Castleford to Osowa | 802.65 mi (1,291.75 km) |
| Castleford to Ostroda | 868.74 mi (1,398.10 km) |
| Castleford to Ostroleka | 941.46 mi (1,515.13 km) |
| Castleford to Ostrow Mazowiecka | 959.00 mi (1,543.36 km) |
| Castleford to Ostrow Wielkopolski | 813.05 mi (1,308.48 km) |
| Castleford to Ostrowiec Swietokrzyski | 975.55 mi (1,570.00 km) |
| Castleford to Ostrzeszow | 822.84 mi (1,324.23 km) |
| Castleford to Oswiecim | 910.11 mi (1,464.67 km) |
| Castleford to Otwock | 944.88 mi (1,520.64 km) |
| Castleford to Ozarow Mazowiecki | 923.98 mi (1,487.00 km) |
| Castleford to Ozimek | 852.05 mi (1,371.24 km) |
| Castleford to Ozorkow | 866.65 mi (1,394.74 km) |
| Castleford to Pabianice | 877.08 mi (1,411.52 km) |
