| Boulder to Burlingame (California) | 935.23 mi (1,505.11 km) |
| Boulder to Burlington (Iowa) | 744.34 mi (1,197.89 km) |
| Boulder to Burlington (Kentucky) | 1,093.97 mi (1,760.57 km) |
| Boulder to Burlington (North Carolina) | 1,423.91 mi (2,291.57 km) |
| Boulder to Burlington (Vermont) | 1,655.26 mi (2,663.88 km) |
| Boulder to Burlington (Wisconsin) | 897.92 mi (1,445.06 km) |
| Boulder to Burnsville (Minnesota) | 692.21 mi (1,114.00 km) |
| Boulder to Burr Ridge (Illinois) | 911.57 mi (1,467.04 km) |
| Boulder to Burton (Michigan) | 1,134.75 mi (1,826.20 km) |
| Boulder to Burtonsville (Maryland) | 1,503.10 mi (2,419.00 km) |
| Boulder to Butler (Pennsylvania) | 1,329.91 mi (2,140.28 km) |
| Boulder to Butte (Montana) | 551.85 mi (888.11 km) |
| Boulder to Byram (Mississippi) | 993.41 mi (1,598.75 km) |
| Boulder to Cabot (Arkansas) | 803.35 mi (1,292.87 km) |
| Boulder to Cadillac (Michigan) | 1,054.42 mi (1,696.92 km) |
