| Boulder to Ayr | 4,371.92 mi (7,035.93 km) |
| Boulder to Bacup | 4,520.13 mi (7,274.45 km) |
| Boulder to Baguley | 4,529.60 mi (7,289.69 km) |
| Boulder to Baildon | 4,528.89 mi (7,288.54 km) |
| Boulder to Bailleston | 4,374.28 mi (7,039.72 km) |
| Boulder to Balderton | 4,594.03 mi (7,393.38 km) |
| Boulder to Baldock | 4,657.42 mi (7,495.39 km) |
| Boulder to Balham | 4,681.37 mi (7,533.94 km) |
| Boulder to Bamber Bridge | 4,503.67 mi (7,247.96 km) |
| Boulder to Banbridge | 4,358.27 mi (7,013.96 km) |
| Boulder to Banbury | 4,615.30 mi (7,427.60 km) |
| Boulder to Bangor | 4,366.69 mi (7,027.50 km) |
| Boulder to Bangor | 4,473.18 mi (7,198.89 km) |
| Boulder to Banstead | 4,684.64 mi (7,539.21 km) |
| Boulder to Bargoed | 4,564.06 mi (7,345.14 km) |
