| Merthyr Tudful to Idar-Oberstein | 487.69 mi (784.87 km) |
| Merthyr Tudful to Idstein | 517.06 mi (832.13 km) |
| Merthyr Tudful to Illertissen | 644.61 mi (1,037.40 km) |
| Merthyr Tudful to Illingen | 485.63 mi (781.55 km) |
| Merthyr Tudful to Ilmenau | 622.10 mi (1,001.18 km) |
| Merthyr Tudful to Ilsede | 577.10 mi (928.75 km) |
| Merthyr Tudful to Ilsenburg | 599.87 mi (965.40 km) |
| Merthyr Tudful to Ilsfeld | 585.60 mi (942.43 km) |
| Merthyr Tudful to Ilvesheim | 546.06 mi (878.79 km) |
| Merthyr Tudful to Immenstadt im Allgau | 671.71 mi (1,081.01 km) |
| Merthyr Tudful to Ingelheim | 512.86 mi (825.36 km) |
| Merthyr Tudful to Ingolstadt | 684.21 mi (1,101.13 km) |
| Merthyr Tudful to Iserlohn | 474.59 mi (763.77 km) |
| Merthyr Tudful to Isernhagen-Sud | 563.11 mi (906.25 km) |
| Merthyr Tudful to Ismaning | 709.84 mi (1,142.37 km) |
