| Merthyr Tudful to Barberton (Ohio) | 3,618.18 mi (5,822.90 km) |
| Merthyr Tudful to Bardstown (Kentucky) | 3,918.20 mi (6,305.74 km) |
| Merthyr Tudful to Barrington (Illinois) | 3,822.33 mi (6,151.45 km) |
| Merthyr Tudful to Barstow (California) | 5,238.78 mi (8,431.01 km) |
| Merthyr Tudful to Bartlesville (Oklahoma) | 4,381.88 mi (7,051.95 km) |
| Merthyr Tudful to Bartlett (Illinois) | 3,833.20 mi (6,168.94 km) |
| Merthyr Tudful to Bartlett (Tennessee) | 4,216.51 mi (6,785.82 km) |
| Merthyr Tudful to Bartow (Florida) | 4,250.32 mi (6,840.23 km) |
| Merthyr Tudful to Batavia (Illinois) | 3,843.27 mi (6,185.15 km) |
| Merthyr Tudful to Batavia (New York) | 3,395.12 mi (5,463.91 km) |
| Merthyr Tudful to Batesville (Arkansas) | 4,261.77 mi (6,858.66 km) |
| Merthyr Tudful to Baton Rouge (Louisiana) | 4,507.80 mi (7,254.60 km) |
| Merthyr Tudful to Battle Creek (Michigan) | 3,703.62 mi (5,960.39 km) |
| Merthyr Tudful to Battle Ground (Washington) | 4,793.22 mi (7,713.95 km) |
| Merthyr Tudful to Bay City (Michigan) | 3,594.38 mi (5,784.60 km) |
