| Niagara Falls to Kamen | 3,857.67 mi (6,208.32 km) |
| Niagara Falls to Kamenz | 4,108.50 mi (6,611.99 km) |
| Niagara Falls to Kamp-Lintfort | 3,817.66 mi (6,143.93 km) |
| Niagara Falls to Kandel | 3,962.57 mi (6,377.15 km) |
| Niagara Falls to Kappeln | 3,841.10 mi (6,181.66 km) |
| Niagara Falls to Karben | 3,945.16 mi (6,349.12 km) |
| Niagara Falls to Karlsdorf-Neuthard | 3,974.20 mi (6,395.86 km) |
| Niagara Falls to Karlsfeld | 4,121.17 mi (6,632.39 km) |
| Niagara Falls to Karlsruhe | 3,973.14 mi (6,394.14 km) |
| Niagara Falls to Kassel | 3,935.98 mi (6,334.35 km) |
| Niagara Falls to Kaufbeuren | 4,100.47 mi (6,599.07 km) |
| Niagara Falls to Kaufering | 4,103.28 mi (6,603.59 km) |
| Niagara Falls to Kaufungen | 3,941.70 mi (6,343.55 km) |
| Niagara Falls to Kehl | 3,965.33 mi (6,381.58 km) |
| Niagara Falls to Kelheim | 4,110.94 mi (6,615.92 km) |
