| Boulder to Bridgeton (Missouri) | 795.38 mi (1,280.03 km) |
| Boulder to Bridgetown (Ohio) | 1,096.92 mi (1,765.32 km) |
| Boulder to Bridgeview (Illinois) | 917.39 mi (1,476.40 km) |
| Boulder to Brigham City (Utah) | 369.76 mi (595.07 km) |
| Boulder to Brighton (Colorado) | 24.42 mi (39.30 km) |
| Boulder to Bristol (Connecticut) | 1,682.63 mi (2,707.93 km) |
| Boulder to Bristol (Tennessee) | 1,268.31 mi (2,041.15 km) |
| Boulder to Bristol (Virginia) | 1,269.93 mi (2,043.75 km) |
| Boulder to Broadlands (Virginia) | 1,473.93 mi (2,372.06 km) |
| Boulder to Broadview Heights (Ohio) | 1,234.82 mi (1,987.25 km) |
| Boulder to Brock Hall (Maryland) | 1,516.69 mi (2,440.88 km) |
| Boulder to Brockton (Massachusetts) | 1,777.12 mi (2,860.00 km) |
| Boulder to Broken Arrow (Oklahoma) | 584.01 mi (939.87 km) |
| Boulder to Bronx (New York) | 1,642.66 mi (2,643.60 km) |
| Boulder to Brook Park (Ohio) | 1,227.01 mi (1,974.69 km) |
