| Castlebar to Brie-Comte-Robert | 625.23 mi (1,006.20 km) |
| Castlebar to Brignais | 841.81 mi (1,354.77 km) |
| Castlebar to Brignoles | 1,002.72 mi (1,613.73 km) |
| Castlebar to Brive-la-Gaillarde | 771.31 mi (1,241.31 km) |
| Castlebar to Bron | 843.75 mi (1,357.89 km) |
| Castlebar to Bruay-sur-l'Escaut | 593.66 mi (955.41 km) |
| Castlebar to Bruges | 731.96 mi (1,177.97 km) |
| Castlebar to Brumath | 813.02 mi (1,308.43 km) |
| Castlebar to Brunoy | 621.23 mi (999.77 km) |
| Castlebar to Bruz | 519.72 mi (836.41 km) |
| Castlebar to Bry-sur-Marne | 615.62 mi (990.74 km) |
| Castlebar to Bully-les-Mines | 560.85 mi (902.60 km) |
| Castlebar to Bures-sur-Yvette | 609.26 mi (980.52 km) |
| Castlebar to Bussy-Saint-Georges | 621.83 mi (1,000.74 km) |
| Castlebar to Buxerolles | 657.38 mi (1,057.95 km) |
