| Castle Rock to Bonham (Texas) | 625.22 mi (1,006.20 km) |
| Castle Rock to Bonita (California) | 822.21 mi (1,323.23 km) |
| Castle Rock to Bonita Springs (Florida) | 1,605.25 mi (2,583.40 km) |
| Castle Rock to Bonney Lake (Washington) | 1,020.97 mi (1,643.10 km) |
| Castle Rock to Boone (Iowa) | 603.35 mi (970.99 km) |
| Castle Rock to Boone (North Carolina) | 1,281.04 mi (2,061.64 km) |
| Castle Rock to Borger (Texas) | 318.90 mi (513.21 km) |
| Castle Rock to Bossier City (Louisiana) | 783.67 mi (1,261.19 km) |
| Castle Rock to Boston (Massachusetts) | 1,764.92 mi (2,840.36 km) |
| Castle Rock to Bostonia (California) | 811.98 mi (1,306.75 km) |
| Castle Rock to Bothell (Washington) | 1,040.76 mi (1,674.94 km) |
| Castle Rock to Bothell East (Washington) | 1,040.99 mi (1,675.31 km) |
| Castle Rock to Bothell West (Washington) | 1,043.25 mi (1,678.96 km) |
| Castle Rock to Boulder (Colorado) | 49.57 mi (79.78 km) |
| Castle Rock to Boulder City (Nevada) | 602.54 mi (969.70 km) |
