| Caerphilly to Idar-Oberstein | 478.61 mi (770.25 km) |
| Caerphilly to Idstein | 508.93 mi (819.04 km) |
| Caerphilly to Illertissen | 634.79 mi (1,021.59 km) |
| Caerphilly to Illingen | 476.04 mi (766.11 km) |
| Caerphilly to Ilmenau | 615.11 mi (989.93 km) |
| Caerphilly to Ilsede | 572.21 mi (920.88 km) |
| Caerphilly to Ilsenburg | 594.43 mi (956.64 km) |
| Caerphilly to Ilsfeld | 576.33 mi (927.51 km) |
| Caerphilly to Ilvesheim | 537.06 mi (864.31 km) |
| Caerphilly to Immenstadt im Allgau | 661.40 mi (1,064.41 km) |
| Caerphilly to Ingelheim | 504.34 mi (811.66 km) |
| Caerphilly to Ingolstadt | 675.25 mi (1,086.70 km) |
| Caerphilly to Iserlohn | 468.13 mi (753.38 km) |
| Caerphilly to Isernhagen-Sud | 558.48 mi (898.79 km) |
| Caerphilly to Ismaning | 700.46 mi (1,127.29 km) |
