| Boulder to Blumberg | 5,138.52 mi (8,269.65 km) |
| Boulder to Bobenheim-Roxheim | 5,050.43 mi (8,127.88 km) |
| Boulder to Bobingen | 5,193.88 mi (8,358.74 km) |
| Boulder to Boblingen | 5,114.44 mi (8,230.90 km) |
| Boulder to Bocholt | 4,889.71 mi (7,869.22 km) |
| Boulder to Bochum | 4,925.03 mi (7,926.06 km) |
| Boulder to Bockenem | 4,992.21 mi (8,034.18 km) |
| Boulder to Bockhorn | 4,862.12 mi (7,824.82 km) |
| Boulder to Bogen | 5,222.18 mi (8,404.28 km) |
| Boulder to Bohl-Iggelheim | 5,058.68 mi (8,141.16 km) |
| Boulder to Bohmte | 4,919.12 mi (7,916.55 km) |
| Boulder to Boizenburg | 4,945.61 mi (7,959.18 km) |
| Boulder to Bonen | 4,937.05 mi (7,945.42 km) |
| Boulder to Bonn | 4,955.69 mi (7,975.41 km) |
| Boulder to Bopfingen | 5,150.16 mi (8,288.38 km) |
