| Porsgrunn to Idar-Oberstein | 656.77 mi (1,056.96 km) |
| Porsgrunn to Idstein | 617.22 mi (993.32 km) |
| Porsgrunn to Illertissen | 753.19 mi (1,212.15 km) |
| Porsgrunn to Illingen | 681.27 mi (1,096.40 km) |
| Porsgrunn to Ilmenau | 584.53 mi (940.70 km) |
| Porsgrunn to Ilsede | 473.57 mi (762.14 km) |
| Porsgrunn to Ilsenburg | 502.28 mi (808.35 km) |
| Porsgrunn to Ilsfeld | 695.71 mi (1,119.64 km) |
| Porsgrunn to Ilvesheim | 667.84 mi (1,074.78 km) |
| Porsgrunn to Immenstadt im Allgau | 798.22 mi (1,284.61 km) |
| Porsgrunn to Ingelheim | 634.99 mi (1,021.92 km) |
| Porsgrunn to Ingolstadt | 718.62 mi (1,156.51 km) |
| Porsgrunn to Iserlohn | 540.21 mi (869.38 km) |
| Porsgrunn to Isernhagen-Sud | 461.68 mi (742.99 km) |
| Porsgrunn to Ismaning | 756.56 mi (1,217.57 km) |
