| Merthyr Tudful to Buenaventura Lakes (Florida) | 4,208.25 mi (6,772.53 km) |
| Merthyr Tudful to Buffalo (Minnesota) | 3,897.39 mi (6,272.25 km) |
| Merthyr Tudful to Buffalo (New York) | 3,425.90 mi (5,513.45 km) |
| Merthyr Tudful to Buffalo Grove (Illinois) | 3,815.20 mi (6,139.97 km) |
| Merthyr Tudful to Buford (Georgia) | 4,034.66 mi (6,493.16 km) |
| Merthyr Tudful to Bull Run (Virginia) | 3,552.21 mi (5,716.74 km) |
| Merthyr Tudful to Bullhead City (Arizona) | 5,140.78 mi (8,273.29 km) |
| Merthyr Tudful to Burbank (California) | 5,319.12 mi (8,560.29 km) |
| Merthyr Tudful to Burbank (Illinois) | 3,827.12 mi (6,159.16 km) |
| Merthyr Tudful to Burien (Washington) | 4,692.09 mi (7,551.20 km) |
| Merthyr Tudful to Burkburnett (Texas) | 4,617.07 mi (7,430.46 km) |
| Merthyr Tudful to Burke (Virginia) | 3,541.79 mi (5,699.95 km) |
| Merthyr Tudful to Burke Centre (Virginia) | 3,542.71 mi (5,701.44 km) |
| Merthyr Tudful to Burleson (Texas) | 4,649.23 mi (7,482.21 km) |
| Merthyr Tudful to Burley (Idaho) | 4,710.56 mi (7,580.92 km) |
