| Merthyr Tudful to Iselin (New Jersey) | 3,342.13 mi (5,378.64 km) |
| Merthyr Tudful to Isla Vista (California) | 5,356.58 mi (8,620.58 km) |
| Merthyr Tudful to Issaquah (Washington) | 4,680.31 mi (7,532.23 km) |
| Merthyr Tudful to Ithaca (New York) | 3,351.27 mi (5,393.35 km) |
| Merthyr Tudful to Ives Estates (Florida) | 4,277.61 mi (6,884.14 km) |
| Merthyr Tudful to Jackson (Michigan) | 3,673.88 mi (5,912.55 km) |
| Merthyr Tudful to Jackson (Mississippi) | 4,376.47 mi (7,043.24 km) |
| Merthyr Tudful to Jackson (Missouri) | 4,105.79 mi (6,607.63 km) |
| Merthyr Tudful to Jackson (Tennessee) | 4,156.77 mi (6,689.68 km) |
| Merthyr Tudful to Jackson (Wyoming) | 4,563.80 mi (7,344.72 km) |
| Merthyr Tudful to Jacksonville (Alabama) | 4,121.88 mi (6,633.53 km) |
| Merthyr Tudful to Jacksonville (Arkansas) | 4,325.62 mi (6,961.41 km) |
| Merthyr Tudful to Jacksonville (Florida) | 4,122.88 mi (6,635.14 km) |
| Merthyr Tudful to Jacksonville (Illinois) | 4,016.22 mi (6,463.48 km) |
| Merthyr Tudful to Jacksonville (North Carolina) | 3,732.54 mi (6,006.95 km) |
