| Merthyr Tudful to Illzach | 550.64 mi (886.16 km) |
| Merthyr Tudful to Ingre | 351.25 mi (565.29 km) |
| Merthyr Tudful to Irigny | 561.17 mi (903.12 km) |
| Merthyr Tudful to Isbergues | 264.19 mi (425.18 km) |
| Merthyr Tudful to Issoire | 523.90 mi (843.14 km) |
| Merthyr Tudful to Issoudun | 409.90 mi (659.67 km) |
| Merthyr Tudful to Issy-les-Moulineaux | 320.56 mi (515.89 km) |
| Merthyr Tudful to Istres | 688.22 mi (1,107.58 km) |
| Merthyr Tudful to Ivry-sur-Seine | 324.88 mi (522.85 km) |
| Merthyr Tudful to Jarville-la-Malgrange | 473.55 mi (762.10 km) |
| Merthyr Tudful to Jeumont | 339.97 mi (547.12 km) |
| Merthyr Tudful to Joigny | 397.93 mi (640.40 km) |
| Merthyr Tudful to Joinville-le-Pont | 327.67 mi (527.33 km) |
| Merthyr Tudful to Joue-les-Tours | 353.25 mi (568.51 km) |
| Merthyr Tudful to Jouy-le-Moutier | 304.17 mi (489.51 km) |
