| Merthyr Tudful to Indianola (Iowa) | 4,065.64 mi (6,543.01 km) |
| Merthyr Tudful to Indio (California) | 5,274.95 mi (8,489.22 km) |
| Merthyr Tudful to Inglewood (California) | 5,332.87 mi (8,582.43 km) |
| Merthyr Tudful to Inkster (Michigan) | 3,628.99 mi (5,840.29 km) |
| Merthyr Tudful to Inver Grove Heights (Minnesota) | 3,884.51 mi (6,251.51 km) |
| Merthyr Tudful to Inwood (New York) | 3,316.59 mi (5,337.54 km) |
| Merthyr Tudful to Iona (Florida) | 4,325.01 mi (6,960.43 km) |
| Merthyr Tudful to Ionia (Michigan) | 3,667.26 mi (5,901.88 km) |
| Merthyr Tudful to Iowa City (Iowa) | 3,975.06 mi (6,397.24 km) |
| Merthyr Tudful to Irmo (South Carolina) | 3,920.29 mi (6,309.10 km) |
| Merthyr Tudful to Irondale (Alabama) | 4,171.73 mi (6,713.76 km) |
| Merthyr Tudful to Ironton (Ohio) | 3,773.36 mi (6,072.64 km) |
| Merthyr Tudful to Irvine (California) | 5,329.74 mi (8,577.38 km) |
| Merthyr Tudful to Irving (Texas) | 4,617.53 mi (7,431.20 km) |
| Merthyr Tudful to Isabela (Puerto Rico) | 4,100.50 mi (6,599.12 km) |
