| Caerphilly to Isny im Allgau | 649.95 mi (1,045.99 km) |
| Caerphilly to Isselburg | 414.74 mi (667.46 km) |
| Caerphilly to Issum | 413.88 mi (666.07 km) |
| Caerphilly to Itzehoe | 555.81 mi (894.49 km) |
| Caerphilly to Jena | 640.67 mi (1,031.06 km) |
| Caerphilly to Jever | 486.23 mi (782.51 km) |
| Caerphilly to Jork | 557.63 mi (897.42 km) |
| Caerphilly to Juchen | 420.51 mi (676.74 km) |
| Caerphilly to Julich | 416.31 mi (669.99 km) |
| Caerphilly to Juterbog | 695.42 mi (1,119.18 km) |
| Caerphilly to Kaarst | 424.37 mi (682.96 km) |
| Caerphilly to Kaiserslautern | 504.18 mi (811.40 km) |
| Caerphilly to Kalkar | 407.50 mi (655.81 km) |
| Caerphilly to Kall | 429.70 mi (691.54 km) |
| Caerphilly to Kaltenkirchen | 572.41 mi (921.21 km) |
