| Castricum to Kobarid | 590.97 mi (951.07 km) |
| Castricum to Kobilje | 661.93 mi (1,065.27 km) |
| Castricum to Kocevje | 662.41 mi (1,066.04 km) |
| Castricum to Komen | 619.37 mi (996.78 km) |
| Castricum to Komenda | 622.87 mi (1,002.41 km) |
| Castricum to Koper | 633.44 mi (1,019.42 km) |
| Castricum to Kostanjevica na Krki | 669.86 mi (1,078.03 km) |
| Castricum to Kostel | 671.08 mi (1,079.99 km) |
| Castricum to Kozje | 662.74 mi (1,066.58 km) |
| Castricum to Kranj | 616.06 mi (991.46 km) |
| Castricum to Kranjska Gora | 584.76 mi (941.08 km) |
| Castricum to Krizevci | 658.64 mi (1,059.97 km) |
| Castricum to Krsko | 666.49 mi (1,072.61 km) |
| Castricum to Kuzma | 644.04 mi (1,036.48 km) |
| Castricum to Lasko | 648.06 mi (1,042.96 km) |
