| Merthyr Tudful to Hormigueros (Puerto Rico) | 4,123.42 mi (6,636.00 km) |
| Merthyr Tudful to Horn Lake (Mississippi) | 4,239.55 mi (6,822.89 km) |
| Merthyr Tudful to Hot Springs (Arkansas) | 4,381.38 mi (7,051.15 km) |
| Merthyr Tudful to Hot Springs Village (Arkansas) | 4,369.66 mi (7,032.28 km) |
| Merthyr Tudful to Houma (Louisiana) | 4,534.15 mi (7,297.01 km) |
| Merthyr Tudful to Houston (Texas) | 4,712.77 mi (7,584.47 km) |
| Merthyr Tudful to Howard (Wisconsin) | 3,711.84 mi (5,973.63 km) |
| Merthyr Tudful to Huber Heights (Ohio) | 3,770.02 mi (6,067.26 km) |
| Merthyr Tudful to Hudson (Florida) | 4,263.23 mi (6,861.00 km) |
| Merthyr Tudful to Hudson (Ohio) | 3,601.46 mi (5,795.99 km) |
| Merthyr Tudful to Hudson (Wisconsin) | 3,866.11 mi (6,221.90 km) |
| Merthyr Tudful to Hueytown (Alabama) | 4,192.32 mi (6,746.88 km) |
| Merthyr Tudful to Hugo (Minnesota) | 3,865.08 mi (6,220.25 km) |
| Merthyr Tudful to Humacao (Puerto Rico) | 4,068.18 mi (6,547.11 km) |
| Merthyr Tudful to Humble (Texas) | 4,697.25 mi (7,559.49 km) |
