| Merthyr Tudful to Bailey's Crossroads (Virginia) | 3,533.19 mi (5,686.12 km) |
| Merthyr Tudful to Bainbridge (Georgia) | 4,215.47 mi (6,784.15 km) |
| Merthyr Tudful to Bainbridge Island (Washington) | 4,688.25 mi (7,545.00 km) |
| Merthyr Tudful to Baker (Louisiana) | 4,501.76 mi (7,244.88 km) |
| Merthyr Tudful to Bakersfield (California) | 5,276.54 mi (8,491.77 km) |
| Merthyr Tudful to Balch Springs (Texas) | 4,610.76 mi (7,420.30 km) |
| Merthyr Tudful to Baldwin (New York) | 3,309.45 mi (5,326.05 km) |
| Merthyr Tudful to Baldwin (Pennsylvania) | 3,580.97 mi (5,763.01 km) |
| Merthyr Tudful to Baldwin Park (California) | 5,313.45 mi (8,551.17 km) |
| Merthyr Tudful to Ballenger Creek (Maryland) | 3,521.36 mi (5,667.09 km) |
| Merthyr Tudful to Ballwin (Missouri) | 4,082.59 mi (6,570.30 km) |
| Merthyr Tudful to Baltimore (Maryland) | 3,491.66 mi (5,619.29 km) |
| Merthyr Tudful to Bangor (Maine) | 2,942.02 mi (4,734.73 km) |
| Merthyr Tudful to Banning (California) | 5,285.44 mi (8,506.10 km) |
| Merthyr Tudful to Baraboo (Wisconsin) | 3,823.39 mi (6,153.15 km) |
