| Boulder to Benisa | 5,240.51 mi (8,433.78 km) |
| Boulder to Berga | 5,160.28 mi (8,304.66 km) |
| Boulder to Berja | 5,197.45 mi (8,364.49 km) |
| Boulder to Bermeo | 4,923.01 mi (7,922.83 km) |
| Boulder to Berriozar | 4,989.77 mi (8,030.26 km) |
| Boulder to Betanzos | 4,707.13 mi (7,575.40 km) |
| Boulder to Betera | 5,180.30 mi (8,336.88 km) |
| Boulder to Bilbao | 4,922.10 mi (7,921.36 km) |
| Boulder to Binefar | 5,110.84 mi (8,225.10 km) |
| Boulder to Binisalem | 5,308.98 mi (8,543.97 km) |
| Boulder to Blanes | 5,216.34 mi (8,394.89 km) |
| Boulder to Boadilla del Monte | 5,004.52 mi (8,054.00 km) |
| Boulder to Boiro | 4,703.46 mi (7,569.49 km) |
| Boulder to Bolanos de Calatrava | 5,076.35 mi (8,169.60 km) |
| Boulder to Bollullos de la Mitacion | 5,039.05 mi (8,109.57 km) |
