| Merthyr Tudful to Ayr | 261.74 mi (421.24 km) |
| Merthyr Tudful to Bacup | 144.19 mi (232.05 km) |
| Merthyr Tudful to Baguley | 123.42 mi (198.62 km) |
| Merthyr Tudful to Baildon | 160.51 mi (258.31 km) |
| Merthyr Tudful to Bailleston | 285.17 mi (458.94 km) |
| Merthyr Tudful to Balderton | 142.39 mi (229.16 km) |
| Merthyr Tudful to Baldock | 137.07 mi (220.59 km) |
| Merthyr Tudful to Balham | 139.98 mi (225.27 km) |
| Merthyr Tudful to Bamber Bridge | 140.40 mi (225.95 km) |
| Merthyr Tudful to Banbridge | 215.84 mi (347.36 km) |
| Merthyr Tudful to Banbury | 89.78 mi (144.49 km) |
| Merthyr Tudful to Bangor | 222.72 mi (358.44 km) |
| Merthyr Tudful to Bangor | 107.34 mi (172.76 km) |
| Merthyr Tudful to Banstead | 139.48 mi (224.46 km) |
| Merthyr Tudful to Bargoed | 6.95 mi (11.19 km) |
