| Round Rock to Bound Brook (New Jersey) | 1,467.18 mi (2,361.20 km) |
| Round Rock to Bountiful (Utah) | 1,067.83 mi (1,718.51 km) |
| Round Rock to Bourbonnais (Illinois) | 916.47 mi (1,474.91 km) |
| Round Rock to Bowie (Maryland) | 1,318.71 mi (2,122.26 km) |
| Round Rock to Bowling Green (Kentucky) | 782.81 mi (1,259.82 km) |
| Round Rock to Bowling Green (Ohio) | 1,081.98 mi (1,741.29 km) |
| Round Rock to Box Elder (South Dakota) | 984.11 mi (1,583.78 km) |
| Round Rock to Boynton Beach (Florida) | 1,101.23 mi (1,772.25 km) |
| Round Rock to Bozeman (Montana) | 1,271.60 mi (2,046.44 km) |
| Round Rock to Bradenton (Florida) | 934.75 mi (1,504.34 km) |
| Round Rock to Bradfordville (Florida) | 800.35 mi (1,288.04 km) |
| Round Rock to Bradley (Illinois) | 916.57 mi (1,475.07 km) |
| Round Rock to Bradley Gardens (New Jersey) | 1,460.93 mi (2,351.13 km) |
| Round Rock to Brainerd (Minnesota) | 1,109.30 mi (1,785.25 km) |
| Round Rock to Brambleton (Virginia) | 1,279.46 mi (2,059.09 km) |
