| Boulder to Brookfield (Illinois) | 915.50 mi (1,473.36 km) |
| Boulder to Brookfield (Wisconsin) | 908.59 mi (1,462.23 km) |
| Boulder to Brookhaven (Georgia) | 1,227.28 mi (1,975.11 km) |
| Boulder to Brookhaven (Mississippi) | 1,012.22 mi (1,629.01 km) |
| Boulder to Brookings (South Dakota) | 524.31 mi (843.79 km) |
| Boulder to Brooklyn (New York) | 1,640.41 mi (2,639.99 km) |
| Boulder to Brooklyn (Ohio) | 1,230.62 mi (1,980.50 km) |
| Boulder to Brooklyn Center (Minnesota) | 699.38 mi (1,125.55 km) |
| Boulder to Brooklyn Park (Maryland) | 1,518.44 mi (2,443.69 km) |
| Boulder to Brooklyn Park (Minnesota) | 699.17 mi (1,125.21 km) |
| Boulder to Brookside (Delaware) | 1,559.85 mi (2,510.34 km) |
| Boulder to Broomall (Pennsylvania) | 1,575.03 mi (2,534.77 km) |
| Boulder to Broomfield (Colorado) | 11.65 mi (18.74 km) |
| Boulder to Broussard (Louisiana) | 1,013.67 mi (1,631.34 km) |
| Boulder to Brown Deer (Wisconsin) | 917.01 mi (1,475.78 km) |
