| Castlebar to Bagnolet | 610.71 mi (982.84 km) |
| Castlebar to Bagnols-sur-Ceze | 917.09 mi (1,475.92 km) |
| Castlebar to Bailleul | 551.43 mi (887.45 km) |
| Castlebar to Balma | 860.31 mi (1,384.53 km) |
| Castlebar to Bar-le-Duc | 714.97 mi (1,150.63 km) |
| Castlebar to Barentin | 529.93 mi (852.84 km) |
| Castlebar to Basse-Goulaine | 572.99 mi (922.14 km) |
| Castlebar to Bastia | 1,150.14 mi (1,850.98 km) |
| Castlebar to Bayeux | 485.70 mi (781.66 km) |
| Castlebar to Bayonne | 799.31 mi (1,286.36 km) |
| Castlebar to Beaucaire | 937.22 mi (1,508.31 km) |
| Castlebar to Beauchamp | 596.38 mi (959.78 km) |
| Castlebar to Beaumont | 784.48 mi (1,262.51 km) |
| Castlebar to Beaumont-sur-Oise | 594.34 mi (956.49 km) |
| Castlebar to Beaune | 778.76 mi (1,253.29 km) |
