| Boulder to Bountiful (Utah) | 352.47 mi (567.25 km) |
| Boulder to Bourbonnais (Illinois) | 913.37 mi (1,469.93 km) |
| Boulder to Bowie (Maryland) | 1,515.61 mi (2,439.14 km) |
| Boulder to Bowling Green (Kentucky) | 1,036.94 mi (1,668.79 km) |
| Boulder to Bowling Green (Ohio) | 1,132.49 mi (1,822.57 km) |
| Boulder to Box Elder (South Dakota) | 303.52 mi (488.47 km) |
| Boulder to Boynton Beach (Florida) | 1,717.80 mi (2,764.54 km) |
| Boulder to Bozeman (Montana) | 488.85 mi (786.73 km) |
| Boulder to Bradenton (Florida) | 1,556.96 mi (2,505.69 km) |
| Boulder to Bradfordville (Florida) | 1,349.69 mi (2,172.12 km) |
| Boulder to Bradley (Illinois) | 915.12 mi (1,472.74 km) |
| Boulder to Bradley Gardens (New Jersey) | 1,604.01 mi (2,581.41 km) |
| Boulder to Brainerd (Minnesota) | 706.96 mi (1,137.75 km) |
| Boulder to Brambleton (Virginia) | 1,473.62 mi (2,371.56 km) |
| Boulder to Brandermill (Virginia) | 1,492.36 mi (2,401.72 km) |
