| Portsmouth to Idar-Oberstein | 378.47 mi (609.09 km) |
| Portsmouth to Idstein | 413.01 mi (664.67 km) |
| Portsmouth to Illertissen | 531.47 mi (855.31 km) |
| Portsmouth to Illingen | 373.87 mi (601.69 km) |
| Portsmouth to Ilmenau | 524.43 mi (843.98 km) |
| Portsmouth to Ilsede | 494.24 mi (795.40 km) |
| Portsmouth to Ilsenburg | 512.76 mi (825.21 km) |
| Portsmouth to Ilsfeld | 475.08 mi (764.56 km) |
| Portsmouth to Ilvesheim | 437.02 mi (703.31 km) |
| Portsmouth to Immenstadt im Allgau | 556.63 mi (895.82 km) |
| Portsmouth to Ingelheim | 406.59 mi (654.34 km) |
| Portsmouth to Ingolstadt | 574.97 mi (925.33 km) |
| Portsmouth to Iserlohn | 381.72 mi (614.32 km) |
| Portsmouth to Isernhagen-Sud | 482.27 mi (776.14 km) |
| Portsmouth to Ismaning | 598.59 mi (963.33 km) |
