| Niagara Falls to Karis | 4,090.02 mi (6,582.26 km) |
| Niagara Falls to Karkkila | 4,087.86 mi (6,578.77 km) |
| Niagara Falls to Kauhajoki | 3,960.19 mi (6,373.32 km) |
| Niagara Falls to Kauhava | 3,959.70 mi (6,372.53 km) |
| Niagara Falls to Kauniainen | 4,114.77 mi (6,622.08 km) |
| Niagara Falls to Kemi | 3,901.72 mi (6,279.21 km) |
| Niagara Falls to Kemijarvi | 3,932.81 mi (6,329.24 km) |
| Niagara Falls to Kempele | 3,955.10 mi (6,365.13 km) |
| Niagara Falls to Kerava | 4,117.87 mi (6,627.08 km) |
| Niagara Falls to Keuruu | 4,034.95 mi (6,493.63 km) |
| Niagara Falls to Kiiminki | 3,953.37 mi (6,362.33 km) |
| Niagara Falls to Kirkkonummi | 4,109.73 mi (6,613.97 km) |
| Niagara Falls to Kitee | 4,183.52 mi (6,732.73 km) |
| Niagara Falls to Kiuruvesi | 4,031.00 mi (6,487.27 km) |
| Niagara Falls to Kivisto | 4,113.73 mi (6,620.41 km) |
