| Boulder to Bonhill | 4,354.48 mi (7,007.85 km) |
| Boulder to Bonnyrigg | 4,406.11 mi (7,090.95 km) |
| Boulder to Bootle | 4,503.63 mi (7,247.89 km) |
| Boulder to Borehamwood | 4,668.36 mi (7,513.00 km) |
| Boulder to Boscombe | 4,652.13 mi (7,486.88 km) |
| Boulder to Boston | 4,622.51 mi (7,439.21 km) |
| Boulder to Bottesford | 4,577.23 mi (7,366.33 km) |
| Boulder to Bourne | 4,619.01 mi (7,433.58 km) |
| Boulder to Bournemouth | 4,650.92 mi (7,484.94 km) |
| Boulder to Bournville | 4,579.82 mi (7,370.51 km) |
| Boulder to Bovingdon | 4,656.58 mi (7,494.05 km) |
| Boulder to Bowdon | 4,527.47 mi (7,286.26 km) |
| Boulder to Boxley | 4,711.15 mi (7,581.86 km) |
| Boulder to Brackley | 4,622.97 mi (7,439.95 km) |
| Boulder to Bracknell | 4,661.93 mi (7,502.65 km) |
