| Castleton to Idar-Oberstein | 486.46 mi (782.87 km) |
| Castleton to Idstein | 501.89 mi (807.72 km) |
| Castleton to Illertissen | 649.06 mi (1,044.56 km) |
| Castleton to Illingen | 491.69 mi (791.30 km) |
| Castleton to Ilmenau | 589.41 mi (948.56 km) |
| Castleton to Ilsede | 522.04 mi (840.14 km) |
| Castleton to Ilsenburg | 550.17 mi (885.42 km) |
| Castleton to Ilsfeld | 583.56 mi (939.15 km) |
| Castleton to Ilvesheim | 541.48 mi (871.42 km) |
| Castleton to Immenstadt im Allgau | 683.09 mi (1,099.32 km) |
| Castleton to Ingelheim | 502.94 mi (809.40 km) |
| Castleton to Ingolstadt | 675.34 mi (1,086.85 km) |
| Castleton to Iserlohn | 440.77 mi (709.36 km) |
| Castleton to Isernhagen-Sud | 505.83 mi (814.05 km) |
| Castleton to Ismaning | 706.21 mi (1,136.54 km) |
