| Portland to Idar-Oberstein | 5,203.81 mi (8,374.72 km) |
| Portland to Idstein | 5,198.00 mi (8,365.37 km) |
| Portland to Illertissen | 5,358.63 mi (8,623.88 km) |
| Portland to Illingen | 5,216.56 mi (8,395.24 km) |
| Portland to Ilmenau | 5,233.29 mi (8,422.16 km) |
| Portland to Ilsede | 5,123.72 mi (8,245.83 km) |
| Portland to Ilsenburg | 5,158.41 mi (8,301.67 km) |
| Portland to Ilsfeld | 5,289.63 mi (8,512.84 km) |
| Portland to Ilvesheim | 5,248.45 mi (8,446.57 km) |
| Portland to Immenstadt im Allgau | 5,400.08 mi (8,690.59 km) |
| Portland to Ingelheim | 5,206.92 mi (8,379.72 km) |
| Portland to Ingolstadt | 5,358.42 mi (8,623.55 km) |
| Portland to Iserlohn | 5,116.35 mi (8,233.97 km) |
| Portland to Isernhagen-Sud | 5,106.57 mi (8,218.23 km) |
| Portland to Ismaning | 5,396.06 mi (8,684.12 km) |
