| Boulder to Barking | 4,685.33 mi (7,540.32 km) |
| Boulder to Barnet | 4,671.40 mi (7,517.90 km) |
| Boulder to Barnoldswick | 4,512.13 mi (7,261.57 km) |
| Boulder to Barnsley | 4,550.19 mi (7,322.82 km) |
| Boulder to Barnstaple | 4,559.09 mi (7,337.15 km) |
| Boulder to Barrhead | 4,367.05 mi (7,028.08 km) |
| Boulder to Barri | 4,574.30 mi (7,361.62 km) |
| Boulder to Barrow in Furness | 4,469.76 mi (7,193.38 km) |
| Boulder to Barton upon Humber | 4,579.24 mi (7,369.58 km) |
| Boulder to Barton upon Irwell | 4,523.72 mi (7,280.23 km) |
| Boulder to Barwell | 4,594.38 mi (7,393.94 km) |
| Boulder to Basford | 4,583.81 mi (7,376.93 km) |
| Boulder to Basildon | 4,697.69 mi (7,560.19 km) |
| Boulder to Basingstoke | 4,656.33 mi (7,493.64 km) |
| Boulder to Bath | 4,607.30 mi (7,414.73 km) |
