| Castle Rock to Brown Deer (Wisconsin) | 913.05 mi (1,469.42 km) |
| Castle Rock to Brownsburg (Indiana) | 982.01 mi (1,580.39 km) |
| Castle Rock to Brownsville (Florida) | 1,702.59 mi (2,740.05 km) |
| Castle Rock to Brownsville (Texas) | 1,018.57 mi (1,639.23 km) |
| Castle Rock to Brownwood (Texas) | 623.77 mi (1,003.85 km) |
| Castle Rock to Brunswick (Georgia) | 1,430.92 mi (2,302.84 km) |
| Castle Rock to Brunswick (Ohio) | 1,216.82 mi (1,958.29 km) |
| Castle Rock to Brushy Creek (Texas) | 732.50 mi (1,178.84 km) |
| Castle Rock to Bryan (Texas) | 768.69 mi (1,237.09 km) |
| Castle Rock to Bryant (Arkansas) | 756.45 mi (1,217.38 km) |
| Castle Rock to Bryn Mawr-Skyway (Washington) | 1,033.54 mi (1,663.32 km) |
| Castle Rock to Buckeye (Arizona) | 596.50 mi (959.97 km) |
| Castle Rock to Buckhall (Virginia) | 1,465.57 mi (2,358.60 km) |
| Castle Rock to Bucyrus (Ohio) | 1,157.80 mi (1,863.31 km) |
| Castle Rock to Buda (Texas) | 755.15 mi (1,215.30 km) |
