| Round Rock to Brown Deer (Wisconsin) | 1,023.33 mi (1,646.88 km) |
| Round Rock to Brownsburg (Indiana) | 903.71 mi (1,454.39 km) |
| Round Rock to Brownsville (Florida) | 1,108.43 mi (1,783.84 km) |
| Round Rock to Brownsville (Texas) | 313.21 mi (504.06 km) |
| Round Rock to Brownwood (Texas) | 112.86 mi (181.64 km) |
| Round Rock to Brunswick (Georgia) | 960.56 mi (1,545.88 km) |
| Round Rock to Brunswick (Ohio) | 1,152.20 mi (1,854.29 km) |
| Round Rock to Brushy Creek (Texas) | 4.54 mi (7.30 km) |
| Round Rock to Bryan (Texas) | 76.93 mi (123.80 km) |
| Round Rock to Bryant (Arkansas) | 412.80 mi (664.33 km) |
| Round Rock to Bryn Mawr-Skyway (Washington) | 1,751.22 mi (2,818.31 km) |
| Round Rock to Buckeye (Arizona) | 899.63 mi (1,447.81 km) |
| Round Rock to Buckhall (Virginia) | 1,277.50 mi (2,055.93 km) |
| Round Rock to Bucyrus (Ohio) | 1,085.63 mi (1,747.15 km) |
| Round Rock to Buda (Texas) | 33.06 mi (53.21 km) |
