| Merthyr Tudful to Hilliard (Ohio) | 3,723.96 mi (5,993.13 km) |
| Merthyr Tudful to Hillsboro (Oregon) | 4,818.28 mi (7,754.28 km) |
| Merthyr Tudful to Hillsborough (California) | 5,255.59 mi (8,458.06 km) |
| Merthyr Tudful to Hillsborough (New Jersey) | 3,358.60 mi (5,405.14 km) |
| Merthyr Tudful to Hilo (Hawaii) | 7,213.79 mi (11,609.48 km) |
| Merthyr Tudful to Hilton Head Island (South Carolina) | 3,993.59 mi (6,427.06 km) |
| Merthyr Tudful to Hinesville (Georgia) | 4,047.33 mi (6,513.55 km) |
| Merthyr Tudful to Hinsdale (Illinois) | 3,830.66 mi (6,164.86 km) |
| Merthyr Tudful to Hobart (Indiana) | 3,818.50 mi (6,145.28 km) |
| Merthyr Tudful to Hobbs (New Mexico) | 4,861.68 mi (7,824.12 km) |
| Merthyr Tudful to Hobe Sound (Florida) | 4,220.10 mi (6,791.59 km) |
| Merthyr Tudful to Hoboken (New Jersey) | 3,322.72 mi (5,347.41 km) |
| Merthyr Tudful to Hockessin (Delaware) | 3,432.28 mi (5,523.73 km) |
| Merthyr Tudful to Hoffman Estates (Illinois) | 3,827.06 mi (6,159.05 km) |
| Merthyr Tudful to Holbrook (New York) | 3,281.20 mi (5,280.58 km) |
