| Castel Gandolfo to Impruneta | 151.54 mi (243.87 km) |
| Castel Gandolfo to Induno Olona | 341.42 mi (549.47 km) |
| Castel Gandolfo to Inverigo | 324.38 mi (522.03 km) |
| Castel Gandolfo to Inveruno | 322.39 mi (518.84 km) |
| Castel Gandolfo to Inzago | 305.79 mi (492.12 km) |
| Castel Gandolfo to Iseo | 299.78 mi (482.44 km) |
| Castel Gandolfo to Isernia | 82.54 mi (132.84 km) |
| Castel Gandolfo to Isola Capo Rizzuto | 303.00 mi (487.63 km) |
| Castel Gandolfo to Isola del Liri | 47.73 mi (76.81 km) |
| Castel Gandolfo to Isola della Scala | 256.87 mi (413.40 km) |
| Castel Gandolfo to Isola Vicentina | 275.15 mi (442.81 km) |
| Castel Gandolfo to Ispica | 363.39 mi (584.81 km) |
| Castel Gandolfo to Istrana | 273.37 mi (439.95 km) |
| Castel Gandolfo to Itri | 55.73 mi (89.68 km) |
| Castel Gandolfo to Ittiri | 226.73 mi (364.89 km) |
