| Castle Rock to Bixby (Oklahoma) | 544.84 mi (876.83 km) |
| Castle Rock to Black Forest (Colorado) | 23.80 mi (38.30 km) |
| Castle Rock to Blackfoot (Idaho) | 469.68 mi (755.88 km) |
| Castle Rock to Blackhawk (California) | 925.79 mi (1,489.92 km) |
| Castle Rock to Blacksburg (Virginia) | 1,328.55 mi (2,138.10 km) |
| Castle Rock to Blackwells Mills (New Jersey) | 1,597.06 mi (2,570.23 km) |
| Castle Rock to Blaine (Minnesota) | 716.32 mi (1,152.81 km) |
| Castle Rock to Bloomingdale (Florida) | 1,516.67 mi (2,440.84 km) |
| Castle Rock to Bloomingdale (Illinois) | 894.89 mi (1,440.18 km) |
| Castle Rock to Bloomington (California) | 785.02 mi (1,263.37 km) |
| Castle Rock to Bloomington (Illinois) | 843.86 mi (1,358.06 km) |
| Castle Rock to Bloomington (Indiana) | 978.78 mi (1,575.19 km) |
| Castle Rock to Bloomington (Minnesota) | 700.31 mi (1,127.04 km) |
| Castle Rock to Bloomsburg (Pennsylvania) | 1,496.45 mi (2,408.30 km) |
| Castle Rock to Blue Ash (Ohio) | 1,092.01 mi (1,757.42 km) |
