| Difficult Run to Idar-Oberstein | 4,026.35 mi (6,479.78 km) |
| Difficult Run to Idstein | 4,050.62 mi (6,518.85 km) |
| Difficult Run to Illertissen | 4,184.27 mi (6,733.92 km) |
| Difficult Run to Illingen | 4,025.26 mi (6,478.03 km) |
| Difficult Run to Ilmenau | 4,142.10 mi (6,666.07 km) |
| Difficult Run to Ilsede | 4,066.63 mi (6,544.61 km) |
| Difficult Run to Ilsenburg | 4,097.55 mi (6,594.37 km) |
| Difficult Run to Ilsfeld | 4,124.63 mi (6,637.95 km) |
| Difficult Run to Ilvesheim | 4,084.27 mi (6,573.00 km) |
| Difficult Run to Immenstadt im Allgau | 4,210.15 mi (6,775.58 km) |
| Difficult Run to Ingelheim | 4,048.94 mi (6,516.13 km) |
| Difficult Run to Ingolstadt | 4,221.83 mi (6,794.38 km) |
| Difficult Run to Iserlohn | 3,993.56 mi (6,427.01 km) |
| Difficult Run to Isernhagen-Sud | 4,049.30 mi (6,516.72 km) |
| Difficult Run to Ismaning | 4,249.00 mi (6,838.11 km) |
