| Castaic to Bougival | 5,626.44 mi (9,054.88 km) |
| Castaic to Bouguenais | 5,579.12 mi (8,978.72 km) |
| Castaic to Boulogne-Billancourt | 5,631.18 mi (9,062.51 km) |
| Castaic to Boulogne-sur-Mer | 5,520.31 mi (8,884.08 km) |
| Castaic to Bourg-de-Peage | 5,911.07 mi (9,512.95 km) |
| Castaic to Bourg-en-Bresse | 5,858.43 mi (9,428.24 km) |
| Castaic to Bourg-la-Reine | 5,636.28 mi (9,070.72 km) |
| Castaic to Bourg-les-Valence | 5,910.39 mi (9,511.85 km) |
| Castaic to Bourges | 5,721.05 mi (9,207.15 km) |
| Castaic to Bourgoin-Jallieu | 5,891.02 mi (9,480.68 km) |
| Castaic to Bressuire | 5,634.28 mi (9,067.50 km) |
| Castaic to Brest | 5,423.62 mi (8,728.47 km) |
| Castaic to Bretigny-sur-Orge | 5,644.11 mi (9,083.32 km) |
| Castaic to Breuillet | 5,641.90 mi (9,079.76 km) |
| Castaic to Briancon | 5,971.03 mi (9,609.45 km) |
