| Castelo Branco to Idar-Oberstein | 994.39 mi (1,600.31 km) |
| Castelo Branco to Idstein | 1,049.69 mi (1,689.32 km) |
| Castelo Branco to Illertissen | 1,045.01 mi (1,681.78 km) |
| Castelo Branco to Illingen | 971.01 mi (1,562.69 km) |
| Castelo Branco to Ilmenau | 1,163.30 mi (1,872.15 km) |
| Castelo Branco to Ilsede | 1,201.78 mi (1,934.08 km) |
| Castelo Branco to Ilsenburg | 1,201.69 mi (1,933.93 km) |
| Castelo Branco to Ilsfeld | 1,040.09 mi (1,673.86 km) |
| Castelo Branco to Ilvesheim | 1,030.11 mi (1,657.80 km) |
| Castelo Branco to Immenstadt im Allgau | 1,030.87 mi (1,659.03 km) |
| Castelo Branco to Ingelheim | 1,031.75 mi (1,660.44 km) |
| Castelo Branco to Ingolstadt | 1,116.88 mi (1,797.44 km) |
| Castelo Branco to Iserlohn | 1,080.32 mi (1,738.60 km) |
| Castelo Branco to Isernhagen-Sud | 1,198.44 mi (1,928.70 km) |
| Castelo Branco to Ismaning | 1,111.16 mi (1,788.25 km) |
