| Niagara Falls to Kelkheim (Taunus) | 3,936.13 mi (6,334.59 km) |
| Niagara Falls to Kelsterbach | 3,941.86 mi (6,343.82 km) |
| Niagara Falls to Kemberg | 4,036.10 mi (6,495.47 km) |
| Niagara Falls to Kempen | 3,817.61 mi (6,143.85 km) |
| Niagara Falls to Kempten | 4,093.77 mi (6,588.29 km) |
| Niagara Falls to Kenzingen | 3,976.42 mi (6,399.43 km) |
| Niagara Falls to Kerpen | 3,844.17 mi (6,186.59 km) |
| Niagara Falls to Ketsch | 3,965.86 mi (6,382.43 km) |
| Niagara Falls to Kevelaer | 3,804.20 mi (6,122.27 km) |
| Niagara Falls to Kiel | 3,859.43 mi (6,211.15 km) |
| Niagara Falls to Kierspe | 3,868.96 mi (6,226.48 km) |
| Niagara Falls to Kirchhain | 3,930.94 mi (6,326.24 km) |
| Niagara Falls to Kirchheim bei Munchen | 4,133.90 mi (6,652.87 km) |
| Niagara Falls to Kirchheim unter Teck | 4,026.83 mi (6,480.55 km) |
| Niagara Falls to Kirchhundem | 3,889.73 mi (6,259.91 km) |
