| Boulder to Idar-Oberstein | 5,009.90 mi (8,062.66 km) |
| Boulder to Idstein | 5,017.73 mi (8,075.26 km) |
| Boulder to Illertissen | 5,172.19 mi (8,323.83 km) |
| Boulder to Illingen | 5,016.76 mi (8,073.69 km) |
| Boulder to Ilmenau | 5,080.25 mi (8,175.87 km) |
| Boulder to Ilsede | 4,981.68 mi (8,017.25 km) |
| Boulder to Ilsenburg | 5,016.12 mi (8,072.67 km) |
| Boulder to Ilsfeld | 5,104.86 mi (8,215.48 km) |
| Boulder to Ilvesheim | 5,062.45 mi (8,147.22 km) |
| Boulder to Immenstadt im Allgau | 5,207.98 mi (8,381.43 km) |
| Boulder to Ingelheim | 5,022.12 mi (8,082.33 km) |
| Boulder to Ingolstadt | 5,189.48 mi (8,351.66 km) |
| Boulder to Iserlohn | 4,944.04 mi (7,956.67 km) |
| Boulder to Isernhagen-Sud | 4,963.73 mi (7,988.35 km) |
| Boulder to Ismaning | 5,223.73 mi (8,406.78 km) |
