| Grenchen to Idar-Oberstein | 174.21 mi (280.37 km) |
| Grenchen to Idstein | 213.14 mi (343.02 km) |
| Grenchen to Illertissen | 143.64 mi (231.16 km) |
| Grenchen to Illingen | 151.85 mi (244.38 km) |
| Grenchen to Ilmenau | 289.45 mi (465.82 km) |
| Grenchen to Ilsede | 372.08 mi (598.81 km) |
| Grenchen to Ilsenburg | 355.03 mi (571.37 km) |
| Grenchen to Ilsfeld | 154.31 mi (248.34 km) |
| Grenchen to Ilvesheim | 166.58 mi (268.09 km) |
| Grenchen to Immenstadt im Allgau | 134.48 mi (216.42 km) |
| Grenchen to Ingelheim | 194.71 mi (313.36 km) |
| Grenchen to Ingolstadt | 215.66 mi (347.06 km) |
| Grenchen to Iserlohn | 289.94 mi (466.62 km) |
| Grenchen to Isernhagen-Sud | 378.49 mi (609.12 km) |
| Grenchen to Ismaning | 211.26 mi (339.99 km) |
