| Castel Gandolfo to Idar-Oberstein | 607.17 mi (977.15 km) |
| Castel Gandolfo to Idstein | 621.78 mi (1,000.65 km) |
| Castel Gandolfo to Illertissen | 464.24 mi (747.12 km) |
| Castel Gandolfo to Illingen | 592.27 mi (953.16 km) |
| Castel Gandolfo to Ilmenau | 622.97 mi (1,002.57 km) |
| Castel Gandolfo to Ilsede | 735.98 mi (1,184.44 km) |
| Castel Gandolfo to Ilsenburg | 705.31 mi (1,135.09 km) |
| Castel Gandolfo to Ilsfeld | 530.76 mi (854.17 km) |
| Castel Gandolfo to Ilvesheim | 568.90 mi (915.56 km) |
| Castel Gandolfo to Immenstadt im Allgau | 419.48 mi (675.09 km) |
| Castel Gandolfo to Ingelheim | 609.68 mi (981.18 km) |
| Castel Gandolfo to Ingolstadt | 488.41 mi (786.02 km) |
| Castel Gandolfo to Iserlohn | 706.25 mi (1,136.60 km) |
| Castel Gandolfo to Isernhagen-Sud | 749.88 mi (1,206.82 km) |
| Castel Gandolfo to Ismaning | 450.23 mi (724.58 km) |
