| Castle Pines to Idar-Oberstein | 5,027.48 mi (8,090.94 km) |
| Castle Pines to Idstein | 5,035.89 mi (8,104.47 km) |
| Castle Pines to Illertissen | 5,189.87 mi (8,352.28 km) |
| Castle Pines to Illingen | 5,034.06 mi (8,101.54 km) |
| Castle Pines to Ilmenau | 5,099.48 mi (8,206.81 km) |
| Castle Pines to Ilsede | 5,001.51 mi (8,049.15 km) |
| Castle Pines to Ilsenburg | 5,035.89 mi (8,104.48 km) |
| Castle Pines to Ilsfeld | 5,122.70 mi (8,244.19 km) |
| Castle Pines to Ilvesheim | 5,080.29 mi (8,175.94 km) |
| Castle Pines to Immenstadt im Allgau | 5,225.36 mi (8,409.40 km) |
| Castle Pines to Ingelheim | 5,040.08 mi (8,111.22 km) |
| Castle Pines to Ingolstadt | 5,207.89 mi (8,381.28 km) |
| Castle Pines to Iserlohn | 4,962.64 mi (7,986.60 km) |
| Castle Pines to Isernhagen-Sud | 4,983.55 mi (8,020.24 km) |
| Castle Pines to Ismaning | 5,241.95 mi (8,436.10 km) |
