| Merthyr Tudful to Harrison (Wisconsin) | 3,736.25 mi (6,012.91 km) |
| Merthyr Tudful to Harrisonburg (Virginia) | 3,623.14 mi (5,830.89 km) |
| Merthyr Tudful to Hartford (Connecticut) | 3,224.32 mi (5,189.03 km) |
| Merthyr Tudful to Hartford (Wisconsin) | 3,778.65 mi (6,081.15 km) |
| Merthyr Tudful to Hartselle (Alabama) | 4,139.47 mi (6,661.83 km) |
| Merthyr Tudful to Hartsville (Tennessee) | 4,013.83 mi (6,459.64 km) |
| Merthyr Tudful to Harvey (Illinois) | 3,828.88 mi (6,161.99 km) |
| Merthyr Tudful to Harvey (Louisiana) | 4,492.48 mi (7,229.94 km) |
| Merthyr Tudful to Hasbrouck Heights (New Jersey) | 3,319.63 mi (5,342.42 km) |
| Merthyr Tudful to Haslett (Michigan) | 3,651.18 mi (5,876.00 km) |
| Merthyr Tudful to Hastings (Minnesota) | 3,881.27 mi (6,246.29 km) |
| Merthyr Tudful to Hastings (Nebraska) | 4,281.87 mi (6,891.00 km) |
| Merthyr Tudful to Hattiesburg (Mississippi) | 4,390.51 mi (7,065.85 km) |
| Merthyr Tudful to Hauppauge (New York) | 3,285.87 mi (5,288.09 km) |
| Merthyr Tudful to Havelock (North Carolina) | 3,703.48 mi (5,960.18 km) |
