| Harpenden to Imola | 757.29 mi (1,218.75 km) |
| Harpenden to Impruneta | 776.90 mi (1,250.30 km) |
| Harpenden to Induno Olona | 586.13 mi (943.28 km) |
| Harpenden to Inverigo | 604.51 mi (972.87 km) |
| Harpenden to Inveruno | 603.97 mi (971.99 km) |
| Harpenden to Inzago | 623.40 mi (1,003.27 km) |
| Harpenden to Iseo | 636.01 mi (1,023.56 km) |
| Harpenden to Isernia | 984.43 mi (1,584.29 km) |
| Harpenden to Isola Capo Rizzuto | 1,221.07 mi (1,965.13 km) |
| Harpenden to Isola del Liri | 958.73 mi (1,542.93 km) |
| Harpenden to Isola della Scala | 687.72 mi (1,106.78 km) |
| Harpenden to Isola Vicentina | 685.56 mi (1,103.31 km) |
| Harpenden to Ispica | 1,278.12 mi (2,056.94 km) |
| Harpenden to Istrana | 706.55 mi (1,137.09 km) |
| Harpenden to Itri | 979.10 mi (1,575.71 km) |
