| Idar-Oberstein to Kobarid | 375.65 mi (604.55 km) |
| Idar-Oberstein to Kobilje | 467.25 mi (751.97 km) |
| Idar-Oberstein to Kocevje | 449.36 mi (723.17 km) |
| Idar-Oberstein to Komen | 402.03 mi (647.00 km) |
| Idar-Oberstein to Komenda | 412.49 mi (663.85 km) |
| Idar-Oberstein to Koper | 414.49 mi (667.06 km) |
| Idar-Oberstein to Kostanjevica na Krki | 461.29 mi (742.38 km) |
| Idar-Oberstein to Kostel | 457.36 mi (736.05 km) |
| Idar-Oberstein to Kozje | 456.87 mi (735.27 km) |
| Idar-Oberstein to Kranj | 404.95 mi (651.70 km) |
| Idar-Oberstein to Kranjska Gora | 372.51 mi (599.49 km) |
| Idar-Oberstein to Krizevci | 461.07 mi (742.02 km) |
| Idar-Oberstein to Krsko | 459.11 mi (738.87 km) |
| Idar-Oberstein to Kuzma | 449.30 mi (723.08 km) |
| Idar-Oberstein to Lasko | 441.16 mi (709.97 km) |
