| Round Rock to Buena Park (California) | 1,209.27 mi (1,946.13 km) |
| Round Rock to Buenaventura Lakes (Florida) | 992.21 mi (1,596.80 km) |
| Round Rock to Buffalo (Minnesota) | 1,033.07 mi (1,662.56 km) |
| Round Rock to Buffalo (New York) | 1,342.49 mi (2,160.53 km) |
| Round Rock to Buffalo Grove (Illinois) | 967.23 mi (1,556.61 km) |
| Round Rock to Buford (Georgia) | 835.27 mi (1,344.24 km) |
| Round Rock to Bull Run (Virginia) | 1,275.17 mi (2,052.18 km) |
| Round Rock to Bullhead City (Arizona) | 1,028.74 mi (1,655.60 km) |
| Round Rock to Burbank (California) | 1,229.73 mi (1,979.06 km) |
| Round Rock to Burbank (Illinois) | 950.16 mi (1,529.14 km) |
| Round Rock to Burien (Washington) | 1,754.36 mi (2,823.37 km) |
| Round Rock to Burkburnett (Texas) | 250.72 mi (403.50 km) |
| Round Rock to Burke (Virginia) | 1,288.09 mi (2,072.98 km) |
| Round Rock to Burke Centre (Virginia) | 1,286.55 mi (2,070.50 km) |
| Round Rock to Burleson (Texas) | 138.86 mi (223.47 km) |
