| Kastamonu to Isny im Allgau | 1,241.82 mi (1,998.52 km) |
| Kastamonu to Isselburg | 1,471.51 mi (2,368.16 km) |
| Kastamonu to Issum | 1,466.91 mi (2,360.77 km) |
| Kastamonu to Itzehoe | 1,411.66 mi (2,271.85 km) |
| Kastamonu to Jena | 1,243.02 mi (2,000.45 km) |
| Kastamonu to Jever | 1,460.07 mi (2,349.76 km) |
| Kastamonu to Jork | 1,393.16 mi (2,242.08 km) |
| Kastamonu to Juchen | 1,454.69 mi (2,341.10 km) |
| Kastamonu to Julich | 1,457.15 mi (2,345.06 km) |
| Kastamonu to Juterbog | 1,217.98 mi (1,960.15 km) |
| Kastamonu to Kaarst | 1,452.27 mi (2,337.20 km) |
| Kastamonu to Kaiserslautern | 1,370.20 mi (2,205.12 km) |
| Kastamonu to Kalkar | 1,476.52 mi (2,376.23 km) |
| Kastamonu to Kall | 1,442.07 mi (2,320.79 km) |
| Kastamonu to Kaltenkirchen | 1,392.95 mi (2,241.73 km) |
