| Kastamonu to Idar-Oberstein | 1,394.51 mi (2,244.25 km) |
| Kastamonu to Idstein | 1,362.77 mi (2,193.17 km) |
| Kastamonu to Illertissen | 1,247.75 mi (2,008.06 km) |
| Kastamonu to Illingen | 1,400.40 mi (2,253.72 km) |
| Kastamonu to Ilmenau | 1,263.45 mi (2,033.32 km) |
| Kastamonu to Ilsede | 1,335.85 mi (2,149.84 km) |
| Kastamonu to Ilsenburg | 1,304.99 mi (2,100.19 km) |
| Kastamonu to Ilsfeld | 1,298.70 mi (2,090.06 km) |
| Kastamonu to Ilvesheim | 1,335.98 mi (2,150.05 km) |
| Kastamonu to Immenstadt im Allgau | 1,231.98 mi (1,982.68 km) |
| Kastamonu to Ingelheim | 1,367.26 mi (2,200.39 km) |
| Kastamonu to Ingolstadt | 1,198.27 mi (1,928.42 km) |
| Kastamonu to Iserlohn | 1,412.75 mi (2,273.59 km) |
| Kastamonu to Isernhagen-Sud | 1,353.20 mi (2,177.77 km) |
| Kastamonu to Ismaning | 1,177.07 mi (1,894.32 km) |
