| South Portland to Idar-Oberstein | 3,536.47 mi (5,691.40 km) |
| South Portland to Idstein | 3,560.36 mi (5,729.85 km) |
| South Portland to Illertissen | 3,694.75 mi (5,946.13 km) |
| South Portland to Illingen | 3,535.63 mi (5,690.04 km) |
| South Portland to Ilmenau | 3,651.48 mi (5,876.49 km) |
| South Portland to Ilsede | 3,575.93 mi (5,754.91 km) |
| South Portland to Ilsenburg | 3,606.84 mi (5,804.65 km) |
| South Portland to Ilsfeld | 3,634.79 mi (5,849.62 km) |
| South Portland to Ilvesheim | 3,594.32 mi (5,784.50 km) |
| South Portland to Immenstadt im Allgau | 3,721.05 mi (5,988.46 km) |
| South Portland to Ingelheim | 3,558.81 mi (5,727.35 km) |
| South Portland to Ingolstadt | 3,731.77 mi (6,005.70 km) |
| South Portland to Iserlohn | 3,502.99 mi (5,637.51 km) |
| South Portland to Isernhagen-Sud | 3,558.61 mi (5,727.03 km) |
| South Portland to Ismaning | 3,759.16 mi (6,049.79 km) |
