| Difficult Run to Illzach | 4,083.93 mi (6,572.45 km) |
| Difficult Run to Ingre | 3,845.82 mi (6,189.26 km) |
| Difficult Run to Irigny | 4,038.12 mi (6,498.73 km) |
| Difficult Run to Isbergues | 3,803.76 mi (6,121.56 km) |
| Difficult Run to Issoire | 3,972.83 mi (6,393.66 km) |
| Difficult Run to Issoudun | 3,878.92 mi (6,242.52 km) |
| Difficult Run to Issy-les-Moulineaux | 3,841.34 mi (6,182.04 km) |
| Difficult Run to Istres | 4,110.51 mi (6,615.23 km) |
| Difficult Run to Ivry-sur-Seine | 3,846.17 mi (6,189.82 km) |
| Difficult Run to Jarville-la-Malgrange | 4,010.46 mi (6,454.21 km) |
| Difficult Run to Jeumont | 3,879.40 mi (6,243.30 km) |
| Difficult Run to Joigny | 3,911.36 mi (6,294.73 km) |
| Difficult Run to Joinville-le-Pont | 3,849.96 mi (6,195.91 km) |
| Difficult Run to Joue-les-Tours | 3,810.49 mi (6,132.39 km) |
| Difficult Run to Jouy-le-Moutier | 3,826.79 mi (6,158.62 km) |
