| Boulder to Beeville (Texas) | 909.25 mi (1,463.30 km) |
| Boulder to Bel Air (Maryland) | 1,528.50 mi (2,459.88 km) |
| Boulder to Bel Air North (Maryland) | 1,526.83 mi (2,457.19 km) |
| Boulder to Bel Air South (Maryland) | 1,530.73 mi (2,463.48 km) |
| Boulder to Belgrade (Montana) | 497.56 mi (800.74 km) |
| Boulder to Bell (California) | 825.34 mi (1,328.26 km) |
| Boulder to Bell Gardens (California) | 824.70 mi (1,327.23 km) |
| Boulder to Bella Vista (Arkansas) | 644.05 mi (1,036.49 km) |
| Boulder to Bellair-Meadowbrook Terrace (Florida) | 1,486.77 mi (2,392.72 km) |
| Boulder to Bellaire (Texas) | 902.37 mi (1,452.22 km) |
| Boulder to Belle Chasse (Louisiana) | 1,110.51 mi (1,787.19 km) |
| Boulder to Belle Glade (Florida) | 1,682.71 mi (2,708.06 km) |
| Boulder to Bellefontaine (Ohio) | 1,131.61 mi (1,821.16 km) |
| Boulder to Bellefontaine Neighbors (Missouri) | 806.12 mi (1,297.32 km) |
| Boulder to Belleville (Illinois) | 821.97 mi (1,322.84 km) |
