| Castle Rock to Baraboo (Wisconsin) | 831.18 mi (1,337.66 km) |
| Castle Rock to Barberton (Ohio) | 1,228.62 mi (1,977.27 km) |
| Castle Rock to Bardstown (Kentucky) | 1,051.00 mi (1,691.42 km) |
| Castle Rock to Barrington (Illinois) | 894.46 mi (1,439.49 km) |
| Castle Rock to Barstow (California) | 739.68 mi (1,190.41 km) |
| Castle Rock to Bartlesville (Oklahoma) | 517.53 mi (832.88 km) |
| Castle Rock to Bartlett (Illinois) | 889.10 mi (1,430.87 km) |
| Castle Rock to Bartlett (Tennessee) | 873.12 mi (1,405.15 km) |
| Castle Rock to Bartow (Florida) | 1,537.77 mi (2,474.80 km) |
| Castle Rock to Batavia (Illinois) | 882.85 mi (1,420.81 km) |
| Castle Rock to Batavia (New York) | 1,403.17 mi (2,258.18 km) |
| Castle Rock to Batesville (Arkansas) | 765.34 mi (1,231.70 km) |
| Castle Rock to Baton Rouge (Louisiana) | 990.77 mi (1,594.49 km) |
| Castle Rock to Battle Creek (Michigan) | 1,043.03 mi (1,678.59 km) |
| Castle Rock to Battle Ground (Washington) | 999.75 mi (1,608.94 km) |
