| Grantham to Idar-Oberstein | 408.30 mi (657.09 km) |
| Grantham to Idstein | 425.31 mi (684.47 km) |
| Grantham to Illertissen | 570.82 mi (918.65 km) |
| Grantham to Illingen | 413.15 mi (664.90 km) |
| Grantham to Ilmenau | 516.71 mi (831.56 km) |
| Grantham to Ilsede | 455.99 mi (733.84 km) |
| Grantham to Ilsenburg | 482.33 mi (776.23 km) |
| Grantham to Ilsfeld | 505.71 mi (813.86 km) |
| Grantham to Ilvesheim | 463.75 mi (746.34 km) |
| Grantham to Immenstadt im Allgau | 604.54 mi (972.92 km) |
| Grantham to Ingelheim | 425.66 mi (685.04 km) |
| Grantham to Ingolstadt | 598.45 mi (963.11 km) |
| Grantham to Iserlohn | 367.45 mi (591.36 km) |
| Grantham to Isernhagen-Sud | 440.54 mi (708.99 km) |
| Grantham to Ismaning | 628.76 mi (1,011.89 km) |
