| Castle Rock to Bougival | 4,890.40 mi (7,870.34 km) |
| Castle Rock to Bouguenais | 4,823.77 mi (7,763.10 km) |
| Castle Rock to Boulogne-Billancourt | 4,895.29 mi (7,878.21 km) |
| Castle Rock to Boulogne-sur-Mer | 4,792.70 mi (7,713.11 km) |
| Castle Rock to Bourg-de-Peage | 5,165.12 mi (8,312.46 km) |
| Castle Rock to Bourg-en-Bresse | 5,118.65 mi (8,237.67 km) |
| Castle Rock to Bourg-la-Reine | 4,900.33 mi (7,886.32 km) |
| Castle Rock to Bourg-les-Valence | 5,163.52 mi (8,309.88 km) |
| Castle Rock to Bourges | 4,976.74 mi (8,009.28 km) |
| Castle Rock to Bourgoin-Jallieu | 5,148.38 mi (8,285.52 km) |
| Castle Rock to Bressuire | 4,880.40 mi (7,854.25 km) |
| Castle Rock to Brest | 4,666.74 mi (7,510.39 km) |
| Castle Rock to Bretigny-sur-Orge | 4,907.25 mi (7,897.46 km) |
| Castle Rock to Breuillet | 4,904.40 mi (7,892.88 km) |
| Castle Rock to Briancon | 5,229.58 mi (8,416.19 km) |
