| Boulder to Bonham (Texas) | 669.50 mi (1,077.46 km) |
| Boulder to Bonita (California) | 828.30 mi (1,333.02 km) |
| Boulder to Bonita Springs (Florida) | 1,644.75 mi (2,646.97 km) |
| Boulder to Bonney Lake (Washington) | 977.18 mi (1,572.62 km) |
| Boulder to Boone (Iowa) | 608.66 mi (979.54 km) |
| Boulder to Boone (North Carolina) | 1,304.80 mi (2,099.87 km) |
| Boulder to Borger (Texas) | 367.49 mi (591.42 km) |
| Boulder to Bossier City (Louisiana) | 826.52 mi (1,330.15 km) |
| Boulder to Boston (Massachusetts) | 1,772.10 mi (2,851.91 km) |
| Boulder to Bostonia (California) | 817.75 mi (1,316.04 km) |
| Boulder to Bothell (Washington) | 996.15 mi (1,603.15 km) |
| Boulder to Bothell East (Washington) | 996.33 mi (1,603.43 km) |
| Boulder to Bothell West (Washington) | 998.62 mi (1,607.12 km) |
| Boulder to Boulder City (Nevada) | 600.73 mi (966.77 km) |
| Boulder to Bound Brook (New Jersey) | 1,610.77 mi (2,592.28 km) |
