| Niagara Falls to Idar-Oberstein | 3,906.48 mi (6,286.87 km) |
| Niagara Falls to Idstein | 3,926.56 mi (6,319.18 km) |
| Niagara Falls to Illertissen | 4,067.06 mi (6,545.30 km) |
| Niagara Falls to Illingen | 3,907.55 mi (6,288.60 km) |
| Niagara Falls to Ilmenau | 4,011.34 mi (6,455.63 km) |
| Niagara Falls to Ilsede | 3,929.27 mi (6,323.54 km) |
| Niagara Falls to Ilsenburg | 3,961.38 mi (6,375.22 km) |
| Niagara Falls to Ilsfeld | 4,004.79 mi (6,445.08 km) |
| Niagara Falls to Ilvesheim | 3,963.49 mi (6,378.63 km) |
| Niagara Falls to Immenstadt im Allgau | 4,095.89 mi (6,591.70 km) |
| Niagara Falls to Ingelheim | 3,926.48 mi (6,319.06 km) |
| Niagara Falls to Ingolstadt | 4,099.52 mi (6,597.54 km) |
| Niagara Falls to Iserlohn | 3,864.55 mi (6,219.38 km) |
| Niagara Falls to Isernhagen-Sud | 3,911.61 mi (6,295.13 km) |
| Niagara Falls to Ismaning | 4,128.83 mi (6,644.71 km) |
