| Mountain Ash to Brownsburg (Indiana) | 3,862.68 mi (6,216.38 km) |
| Mountain Ash to Brownsville (Florida) | 4,287.72 mi (6,900.42 km) |
| Mountain Ash to Brownsville (Texas) | 4,994.48 mi (8,037.84 km) |
| Mountain Ash to Brownwood (Texas) | 4,756.39 mi (7,654.67 km) |
| Mountain Ash to Brunswick (Georgia) | 4,075.52 mi (6,558.91 km) |
| Mountain Ash to Brunswick (Ohio) | 3,617.78 mi (5,822.25 km) |
| Mountain Ash to Brushy Creek (Texas) | 4,770.06 mi (7,676.67 km) |
| Mountain Ash to Bryan (Texas) | 4,708.53 mi (7,577.64 km) |
| Mountain Ash to Bryant (Arkansas) | 4,354.64 mi (7,008.12 km) |
| Mountain Ash to Bryn Mawr-Skyway (Washington) | 4,691.60 mi (7,550.40 km) |
| Mountain Ash to Buckeye (Arizona) | 5,170.85 mi (8,321.68 km) |
| Mountain Ash to Buckhall (Virginia) | 3,552.89 mi (5,717.82 km) |
| Mountain Ash to Bucyrus (Ohio) | 3,683.32 mi (5,927.73 km) |
| Mountain Ash to Buda (Texas) | 4,797.06 mi (7,720.12 km) |
| Mountain Ash to Buena Park (California) | 5,329.90 mi (8,577.65 km) |
