| Round Rock to Baraboo (Wisconsin) | 994.32 mi (1,600.20 km) |
| Round Rock to Barberton (Ohio) | 1,152.23 mi (1,854.33 km) |
| Round Rock to Bardstown (Kentucky) | 859.48 mi (1,383.19 km) |
| Round Rock to Barrington (Illinois) | 961.25 mi (1,546.99 km) |
| Round Rock to Barstow (California) | 1,164.10 mi (1,873.44 km) |
| Round Rock to Bartlesville (Oklahoma) | 440.25 mi (708.52 km) |
| Round Rock to Bartlett (Illinois) | 949.34 mi (1,527.81 km) |
| Round Rock to Bartlett (Tennessee) | 559.10 mi (899.79 km) |
| Round Rock to Bartow (Florida) | 971.84 mi (1,564.03 km) |
| Round Rock to Batavia (Illinois) | 938.81 mi (1,510.86 km) |
| Round Rock to Batavia (New York) | 1,374.52 mi (2,212.07 km) |
| Round Rock to Batesville (Arkansas) | 503.07 mi (809.62 km) |
| Round Rock to Baton Rouge (Louisiana) | 388.99 mi (626.01 km) |
| Round Rock to Battle Creek (Michigan) | 1,065.11 mi (1,714.12 km) |
| Round Rock to Battle Ground (Washington) | 1,701.52 mi (2,738.34 km) |
