| Merthyr Tudful to Bear (Delaware) | 3,439.48 mi (5,535.30 km) |
| Merthyr Tudful to Beatrice (Nebraska) | 4,237.06 mi (6,818.89 km) |
| Merthyr Tudful to Beaufort (South Carolina) | 3,979.44 mi (6,404.29 km) |
| Merthyr Tudful to Beaumont (California) | 5,290.19 mi (8,513.74 km) |
| Merthyr Tudful to Beaumont (Texas) | 4,647.62 mi (7,479.63 km) |
| Merthyr Tudful to Beaver Dam (Wisconsin) | 3,789.18 mi (6,098.10 km) |
| Merthyr Tudful to Beavercreek (Ohio) | 3,773.88 mi (6,073.47 km) |
| Merthyr Tudful to Beaverton (Oregon) | 4,817.76 mi (7,753.44 km) |
| Merthyr Tudful to Beckley (West Virginia) | 3,747.07 mi (6,030.32 km) |
| Merthyr Tudful to Bedford (Indiana) | 3,910.56 mi (6,293.44 km) |
| Merthyr Tudful to Bedford (Ohio) | 3,598.52 mi (5,791.27 km) |
| Merthyr Tudful to Bedford (Texas) | 4,624.57 mi (7,442.52 km) |
| Merthyr Tudful to Bedford Heights (Ohio) | 3,596.76 mi (5,788.43 km) |
| Merthyr Tudful to Beech Grove (Indiana) | 3,854.86 mi (6,203.80 km) |
| Merthyr Tudful to Beeville (Texas) | 4,878.52 mi (7,851.22 km) |
