| Castle Rock to Bound Brook (New Jersey) | 1,599.38 mi (2,573.96 km) |
| Castle Rock to Bountiful (Utah) | 384.44 mi (618.70 km) |
| Castle Rock to Bourbonnais (Illinois) | 901.97 mi (1,451.57 km) |
| Castle Rock to Bowie (Maryland) | 1,500.17 mi (2,414.28 km) |
| Castle Rock to Bowling Green (Kentucky) | 1,012.15 mi (1,628.90 km) |
| Castle Rock to Bowling Green (Ohio) | 1,121.76 mi (1,805.30 km) |
| Castle Rock to Box Elder (South Dakota) | 339.69 mi (546.68 km) |
| Castle Rock to Boynton Beach (Florida) | 1,679.77 mi (2,703.32 km) |
| Castle Rock to Bozeman (Montana) | 537.80 mi (865.50 km) |
| Castle Rock to Bradenton (Florida) | 1,518.04 mi (2,443.05 km) |
| Castle Rock to Bradfordville (Florida) | 1,313.36 mi (2,113.65 km) |
| Castle Rock to Bradley (Illinois) | 903.64 mi (1,454.26 km) |
| Castle Rock to Bradley Gardens (New Jersey) | 1,592.61 mi (2,563.05 km) |
| Castle Rock to Brainerd (Minnesota) | 722.50 mi (1,162.75 km) |
| Castle Rock to Brambleton (Virginia) | 1,457.97 mi (2,346.37 km) |
