| Round Rock to Bonham (Texas) | 228.42 mi (367.61 km) |
| Round Rock to Bonita (California) | 1,147.58 mi (1,846.85 km) |
| Round Rock to Bonita Springs (Florida) | 1,005.74 mi (1,618.59 km) |
| Round Rock to Bonney Lake (Washington) | 1,736.56 mi (2,794.72 km) |
| Round Rock to Boone (Iowa) | 823.59 mi (1,325.44 km) |
| Round Rock to Boone (North Carolina) | 1,001.52 mi (1,611.79 km) |
| Round Rock to Borger (Texas) | 415.32 mi (668.39 km) |
| Round Rock to Bossier City (Louisiana) | 272.80 mi (439.02 km) |
| Round Rock to Boston (Massachusetts) | 1,677.21 mi (2,699.21 km) |
| Round Rock to Bostonia (California) | 1,143.31 mi (1,839.97 km) |
| Round Rock to Bothell (Washington) | 1,760.41 mi (2,833.10 km) |
| Round Rock to Bothell East (Washington) | 1,760.90 mi (2,833.89 km) |
| Round Rock to Bothell West (Washington) | 1,763.02 mi (2,837.30 km) |
| Round Rock to Boulder (Colorado) | 782.76 mi (1,259.72 km) |
| Round Rock to Boulder City (Nevada) | 1,061.70 mi (1,708.64 km) |
