| Mountain Ash to Blue Springs (Missouri) | 4,207.61 mi (6,771.49 km) |
| Mountain Ash to Bluffdale (Utah) | 4,764.10 mi (7,667.08 km) |
| Mountain Ash to Bluffton (Indiana) | 3,773.31 mi (6,072.56 km) |
| Mountain Ash to Bluffton (South Carolina) | 4,000.91 mi (6,438.84 km) |
| Mountain Ash to Blythe (California) | 5,228.81 mi (8,414.96 km) |
| Mountain Ash to Blytheville (Arkansas) | 4,187.38 mi (6,738.94 km) |
| Mountain Ash to Boca Raton (Florida) | 4,254.17 mi (6,846.42 km) |
| Mountain Ash to Boerne (Texas) | 4,846.90 mi (7,800.34 km) |
| Mountain Ash to Bogalusa (Louisiana) | 4,440.40 mi (7,146.13 km) |
| Mountain Ash to Boiling Springs (South Carolina) | 3,908.86 mi (6,290.70 km) |
| Mountain Ash to Boise (Idaho) | 4,732.07 mi (7,615.54 km) |
| Mountain Ash to Bolingbrook (Illinois) | 3,844.28 mi (6,186.77 km) |
| Mountain Ash to Bolivar (Missouri) | 4,243.46 mi (6,829.19 km) |
| Mountain Ash to Bon Air (Virginia) | 3,612.26 mi (5,813.38 km) |
| Mountain Ash to Bonham (Texas) | 4,551.60 mi (7,325.09 km) |
