| Round Rock to Bonhill | 4,610.94 mi (7,420.60 km) |
| Round Rock to Bonnyrigg | 4,666.49 mi (7,510.00 km) |
| Round Rock to Bootle | 4,734.12 mi (7,618.82 km) |
| Round Rock to Borehamwood | 4,888.56 mi (7,867.37 km) |
| Round Rock to Boscombe | 4,853.99 mi (7,811.74 km) |
| Round Rock to Boston | 4,859.61 mi (7,820.78 km) |
| Round Rock to Bottesford | 4,818.54 mi (7,754.69 km) |
| Round Rock to Bourne | 4,852.11 mi (7,808.71 km) |
| Round Rock to Bournemouth | 4,852.54 mi (7,809.40 km) |
| Round Rock to Bournville | 4,802.12 mi (7,728.27 km) |
| Round Rock to Bovingdon | 4,876.39 mi (7,847.79 km) |
| Round Rock to Bowdon | 4,759.63 mi (7,659.88 km) |
| Round Rock to Boxley | 4,930.80 mi (7,935.35 km) |
| Round Rock to Brackley | 4,843.81 mi (7,795.37 km) |
| Round Rock to Bracknell | 4,877.08 mi (7,848.91 km) |
