| Caernarfon to Illzach | 629.78 mi (1,013.53 km) |
| Caernarfon to Ingre | 448.76 mi (722.21 km) |
| Caernarfon to Irigny | 657.16 mi (1,057.60 km) |
| Caernarfon to Isbergues | 335.28 mi (539.58 km) |
| Caernarfon to Issoire | 623.74 mi (1,003.82 km) |
| Caernarfon to Issoudun | 509.73 mi (820.33 km) |
| Caernarfon to Issy-les-Moulineaux | 411.82 mi (662.76 km) |
| Caernarfon to Istres | 787.99 mi (1,268.14 km) |
| Caernarfon to Ivry-sur-Seine | 415.80 mi (669.16 km) |
| Caernarfon to Jarville-la-Malgrange | 550.30 mi (885.62 km) |
| Caernarfon to Jeumont | 408.38 mi (657.23 km) |
| Caernarfon to Joigny | 489.63 mi (787.98 km) |
| Caernarfon to Joinville-le-Pont | 418.07 mi (672.81 km) |
| Caernarfon to Joue-les-Tours | 455.22 mi (732.61 km) |
| Caernarfon to Jouy-le-Moutier | 395.18 mi (635.99 km) |
