| Fort Collins to Idar-Oberstein | 4,975.59 mi (8,007.44 km) |
| Fort Collins to Idstein | 4,983.21 mi (8,019.70 km) |
| Fort Collins to Illertissen | 5,137.83 mi (8,268.55 km) |
| Fort Collins to Illingen | 4,982.54 mi (8,018.63 km) |
| Fort Collins to Ilmenau | 5,045.34 mi (8,119.69 km) |
| Fort Collins to Ilsede | 4,946.58 mi (7,960.74 km) |
| Fort Collins to Ilsenburg | 4,981.03 mi (8,016.20 km) |
| Fort Collins to Ilsfeld | 5,070.45 mi (8,160.10 km) |
| Fort Collins to Ilvesheim | 5,028.03 mi (8,091.84 km) |
| Fort Collins to Immenstadt im Allgau | 5,173.73 mi (8,326.32 km) |
| Fort Collins to Ingelheim | 4,987.67 mi (8,026.88 km) |
| Fort Collins to Ingolstadt | 5,154.86 mi (8,295.94 km) |
| Fort Collins to Iserlohn | 4,909.36 mi (7,900.85 km) |
| Fort Collins to Isernhagen-Sud | 4,928.63 mi (7,931.86 km) |
| Fort Collins to Ismaning | 5,189.18 mi (8,351.17 km) |
