| Niagara Falls to Isny im Allgau | 4,084.32 mi (6,573.07 km) |
| Niagara Falls to Isselburg | 3,804.50 mi (6,122.75 km) |
| Niagara Falls to Issum | 3,812.23 mi (6,135.20 km) |
| Niagara Falls to Itzehoe | 3,850.08 mi (6,196.11 km) |
| Niagara Falls to Jena | 4,027.77 mi (6,482.06 km) |
| Niagara Falls to Jever | 3,802.76 mi (6,119.95 km) |
| Niagara Falls to Jork | 3,868.76 mi (6,226.16 km) |
| Niagara Falls to Juchen | 3,829.27 mi (6,162.62 km) |
| Niagara Falls to Julich | 3,829.54 mi (6,163.05 km) |
| Niagara Falls to Juterbog | 4,044.65 mi (6,509.23 km) |
| Niagara Falls to Kaarst | 3,829.95 mi (6,163.71 km) |
| Niagara Falls to Kaiserslautern | 3,933.31 mi (6,330.05 km) |
| Niagara Falls to Kalkar | 3,800.88 mi (6,116.92 km) |
| Niagara Falls to Kall | 3,849.03 mi (6,194.41 km) |
| Niagara Falls to Kaltenkirchen | 3,868.80 mi (6,226.24 km) |
