| Thornton to Idar-Oberstein | 482.14 mi (775.94 km) |
| Thornton to Idstein | 495.58 mi (797.57 km) |
| Thornton to Illertissen | 644.76 mi (1,037.65 km) |
| Thornton to Illingen | 488.35 mi (785.93 km) |
| Thornton to Ilmenau | 580.36 mi (934.00 km) |
| Thornton to Ilsede | 510.34 mi (821.31 km) |
| Thornton to Ilsenburg | 539.06 mi (867.53 km) |
| Thornton to Ilsfeld | 578.64 mi (931.23 km) |
| Thornton to Ilvesheim | 536.40 mi (863.25 km) |
| Thornton to Immenstadt im Allgau | 679.63 mi (1,093.75 km) |
| Thornton to Ingelheim | 497.34 mi (800.39 km) |
| Thornton to Ingolstadt | 669.16 mi (1,076.90 km) |
| Thornton to Iserlohn | 432.30 mi (695.72 km) |
| Thornton to Isernhagen-Sud | 493.90 mi (794.86 km) |
| Thornton to Ismaning | 700.64 mi (1,127.57 km) |
