| Merthyr Tudful to Imola | 861.37 mi (1,386.24 km) |
| Merthyr Tudful to Impruneta | 876.16 mi (1,410.04 km) |
| Merthyr Tudful to Induno Olona | 687.52 mi (1,106.46 km) |
| Merthyr Tudful to Inverigo | 706.79 mi (1,137.47 km) |
| Merthyr Tudful to Inveruno | 703.36 mi (1,131.94 km) |
| Merthyr Tudful to Inzago | 725.57 mi (1,167.69 km) |
| Merthyr Tudful to Iseo | 741.07 mi (1,192.64 km) |
| Merthyr Tudful to Isernia | 1,085.18 mi (1,746.43 km) |
| Merthyr Tudful to Isola Capo Rizzuto | 1,321.51 mi (2,126.77 km) |
| Merthyr Tudful to Isola del Liri | 1,057.64 mi (1,702.11 km) |
| Merthyr Tudful to Isola della Scala | 793.98 mi (1,277.79 km) |
| Merthyr Tudful to Isola Vicentina | 795.03 mi (1,279.48 km) |
| Merthyr Tudful to Ispica | 1,365.64 mi (2,197.78 km) |
| Merthyr Tudful to Istrana | 818.07 mi (1,316.56 km) |
| Merthyr Tudful to Itri | 1,076.39 mi (1,732.29 km) |
