| Boulder to Beltsville (Maryland) | 1,504.93 mi (2,421.95 km) |
| Boulder to Belvedere Park (Georgia) | 1,234.81 mi (1,987.24 km) |
| Boulder to Belvidere (Illinois) | 865.11 mi (1,392.25 km) |
| Boulder to Bemidji (Minnesota) | 729.21 mi (1,173.55 km) |
| Boulder to Benbrook (Texas) | 666.85 mi (1,073.19 km) |
| Boulder to Bend (Oregon) | 868.05 mi (1,397.00 km) |
| Boulder to Benicia (California) | 915.39 mi (1,473.18 km) |
| Boulder to Bensenville (Illinois) | 910.88 mi (1,465.92 km) |
| Boulder to Bensville (Maryland) | 1,506.51 mi (2,424.50 km) |
| Boulder to Benton (Arkansas) | 791.00 mi (1,272.99 km) |
| Boulder to Bentonville (Arkansas) | 649.45 mi (1,045.19 km) |
| Boulder to Berea (Kentucky) | 1,138.41 mi (1,832.09 km) |
| Boulder to Berea (Ohio) | 1,224.97 mi (1,971.39 km) |
| Boulder to Berea (South Carolina) | 1,295.38 mi (2,084.71 km) |
| Boulder to Bergenfield (New Jersey) | 1,635.10 mi (2,631.44 km) |
