| Boulder to Badger (Alaska) | 2,386.74 mi (3,841.09 km) |
| Boulder to Bailey's Crossroads (Virginia) | 1,496.64 mi (2,408.61 km) |
| Boulder to Bainbridge (Georgia) | 1,318.73 mi (2,122.28 km) |
| Boulder to Bainbridge Island (Washington) | 1,006.46 mi (1,619.74 km) |
| Boulder to Baker (Louisiana) | 1,025.91 mi (1,651.05 km) |
| Boulder to Bakersfield (California) | 818.69 mi (1,317.56 km) |
| Boulder to Balch Springs (Texas) | 696.20 mi (1,120.43 km) |
| Boulder to Baldwin (New York) | 1,658.12 mi (2,668.48 km) |
| Boulder to Baldwin (Pennsylvania) | 1,330.11 mi (2,140.60 km) |
| Boulder to Baldwin Park (California) | 811.52 mi (1,306.01 km) |
| Boulder to Ballenger Creek (Maryland) | 1,474.13 mi (2,372.38 km) |
| Boulder to Ballwin (Missouri) | 791.25 mi (1,273.39 km) |
| Boulder to Baltimore (Maryland) | 1,517.42 mi (2,442.04 km) |
| Boulder to Bangor (Maine) | 1,872.72 mi (3,013.85 km) |
| Boulder to Banning (California) | 766.83 mi (1,234.09 km) |
