| Castle Rock to Buena Park (California) | 821.83 mi (1,322.60 km) |
| Castle Rock to Buenaventura Lakes (Florida) | 1,542.34 mi (2,482.16 km) |
| Castle Rock to Buffalo (Minnesota) | 689.19 mi (1,109.15 km) |
| Castle Rock to Buffalo (New York) | 1,369.22 mi (2,203.55 km) |
| Castle Rock to Buffalo Grove (Illinois) | 903.06 mi (1,453.33 km) |
| Castle Rock to Buford (Georgia) | 1,207.58 mi (1,943.41 km) |
| Castle Rock to Bull Run (Virginia) | 1,461.01 mi (2,351.27 km) |
| Castle Rock to Bullhead City (Arizona) | 608.31 mi (978.98 km) |
| Castle Rock to Burbank (California) | 825.95 mi (1,329.25 km) |
| Castle Rock to Burbank (Illinois) | 910.03 mi (1,464.55 km) |
| Castle Rock to Burien (Washington) | 1,037.08 mi (1,669.02 km) |
| Castle Rock to Burkburnett (Texas) | 505.08 mi (812.84 km) |
| Castle Rock to Burke (Virginia) | 1,474.67 mi (2,373.25 km) |
| Castle Rock to Burke Centre (Virginia) | 1,472.57 mi (2,369.87 km) |
| Castle Rock to Burleson (Texas) | 633.14 mi (1,018.94 km) |
