| Frederick to Idar-Oberstein | 4,005.10 mi (6,445.59 km) |
| Frederick to Idstein | 4,028.93 mi (6,483.93 km) |
| Frederick to Illertissen | 4,163.36 mi (6,700.28 km) |
| Frederick to Illingen | 4,004.24 mi (6,444.21 km) |
| Frederick to Ilmenau | 4,119.72 mi (6,630.05 km) |
| Frederick to Ilsede | 4,043.52 mi (6,507.41 km) |
| Frederick to Ilsenburg | 4,074.58 mi (6,557.40 km) |
| Frederick to Ilsfeld | 4,103.42 mi (6,603.81 km) |
| Frederick to Ilvesheim | 4,062.94 mi (6,538.68 km) |
| Frederick to Immenstadt im Allgau | 4,189.57 mi (6,742.46 km) |
| Frederick to Ingelheim | 4,027.42 mi (6,481.50 km) |
| Frederick to Ingolstadt | 4,200.38 mi (6,759.86 km) |
| Frederick to Iserlohn | 3,971.32 mi (6,391.22 km) |
| Frederick to Isernhagen-Sud | 4,026.15 mi (6,479.46 km) |
| Frederick to Ismaning | 4,227.79 mi (6,803.98 km) |
