| Port Neches to Idar-Oberstein | 5,128.85 mi (8,254.08 km) |
| Port Neches to Idstein | 5,149.79 mi (8,287.79 km) |
| Port Neches to Illertissen | 5,288.87 mi (8,511.61 km) |
| Port Neches to Illingen | 5,129.39 mi (8,254.95 km) |
| Port Neches to Ilmenau | 5,235.46 mi (8,425.65 km) |
| Port Neches to Ilsede | 5,153.58 mi (8,293.89 km) |
| Port Neches to Ilsenburg | 5,185.70 mi (8,345.58 km) |
| Port Neches to Ilsfeld | 5,227.21 mi (8,412.38 km) |
| Port Neches to Ilvesheim | 5,186.10 mi (8,346.23 km) |
| Port Neches to Immenstadt im Allgau | 5,316.88 mi (8,556.69 km) |
| Port Neches to Ingelheim | 5,149.42 mi (8,287.19 km) |
| Port Neches to Ingolstadt | 5,322.52 mi (8,565.77 km) |
| Port Neches to Iserlohn | 5,088.46 mi (8,189.08 km) |
| Port Neches to Isernhagen-Sud | 5,135.92 mi (8,265.46 km) |
| Port Neches to Ismaning | 5,351.40 mi (8,612.24 km) |
