| Holyhead to Illzach | 648.67 mi (1,043.94 km) |
| Holyhead to Ingre | 467.31 mi (752.06 km) |
| Holyhead to Irigny | 675.90 mi (1,087.76 km) |
| Holyhead to Isbergues | 354.05 mi (569.79 km) |
| Holyhead to Issoire | 642.03 mi (1,033.24 km) |
| Holyhead to Issoudun | 527.99 mi (849.72 km) |
| Holyhead to Issy-les-Moulineaux | 430.75 mi (693.22 km) |
| Holyhead to Istres | 806.30 mi (1,297.62 km) |
| Holyhead to Ivry-sur-Seine | 434.74 mi (699.65 km) |
| Holyhead to Jarville-la-Malgrange | 569.14 mi (915.94 km) |
| Holyhead to Jeumont | 426.97 mi (687.13 km) |
| Holyhead to Joigny | 508.56 mi (818.45 km) |
| Holyhead to Joinville-le-Pont | 437.02 mi (703.32 km) |
| Holyhead to Joue-les-Tours | 472.98 mi (761.18 km) |
| Holyhead to Jouy-le-Moutier | 414.12 mi (666.45 km) |
