| Hertford to Idar-Oberstein | 353.51 mi (568.92 km) |
| Hertford to Idstein | 378.81 mi (609.63 km) |
| Hertford to Illertissen | 513.90 mi (827.05 km) |
| Hertford to Illingen | 354.45 mi (570.44 km) |
| Hertford to Ilmenau | 481.37 mi (774.69 km) |
| Hertford to Ilsede | 437.00 mi (703.28 km) |
| Hertford to Ilsenburg | 459.07 mi (738.80 km) |
| Hertford to Ilsfeld | 451.89 mi (727.25 km) |
| Hertford to Ilvesheim | 411.15 mi (661.68 km) |
| Hertford to Immenstadt im Allgau | 544.40 mi (876.13 km) |
| Hertford to Ingelheim | 375.98 mi (605.08 km) |
| Hertford to Ingolstadt | 548.66 mi (882.98 km) |
| Hertford to Iserlohn | 333.49 mi (536.71 km) |
| Hertford to Isernhagen-Sud | 423.46 mi (681.50 km) |
| Hertford to Ismaning | 576.21 mi (927.31 km) |
