| Castlebar to Bois-Colombes | 603.32 mi (970.94 km) |
| Castlebar to Bois-d'Arcy | 600.09 mi (965.75 km) |
| Castlebar to Bois-Guillaume | 538.96 mi (867.36 km) |
| Castlebar to Boissy-Saint-Leger | 619.12 mi (996.38 km) |
| Castlebar to Bolbec | 511.88 mi (823.79 km) |
| Castlebar to Bollene | 914.68 mi (1,472.04 km) |
| Castlebar to Bondoufle | 620.63 mi (998.80 km) |
| Castlebar to Bondues | 566.52 mi (911.72 km) |
| Castlebar to Bondy | 611.58 mi (984.25 km) |
| Castlebar to Bonneuil-sur-Marne | 617.29 mi (993.44 km) |
| Castlebar to Bonneville | 877.58 mi (1,412.34 km) |
| Castlebar to Bordeaux | 735.32 mi (1,183.38 km) |
| Castlebar to Borgo | 1,157.01 mi (1,862.03 km) |
| Castlebar to Bouc-Bel-Air | 980.03 mi (1,577.20 km) |
| Castlebar to Boucau | 797.04 mi (1,282.72 km) |
