| Niagara Falls to Jozefow | 4,328.02 mi (6,965.27 km) |
| Niagara Falls to Kalisz | 4,233.12 mi (6,812.54 km) |
| Niagara Falls to Kamien Pomorski | 4,034.44 mi (6,492.81 km) |
| Niagara Falls to Kamienna Gora | 4,197.20 mi (6,754.74 km) |
| Niagara Falls to Karczew | 4,330.62 mi (6,969.46 km) |
| Niagara Falls to Kartuzy | 4,138.50 mi (6,660.28 km) |
| Niagara Falls to Katowice | 4,325.41 mi (6,961.08 km) |
| Niagara Falls to Kedzierzyn-Kozle | 4,292.65 mi (6,908.35 km) |
| Niagara Falls to Kepno | 4,248.17 mi (6,836.77 km) |
| Niagara Falls to Ketrzyn | 4,254.61 mi (6,847.13 km) |
| Niagara Falls to Kety | 4,347.37 mi (6,996.42 km) |
| Niagara Falls to Kielce | 4,358.39 mi (7,014.14 km) |
| Niagara Falls to Kielczow | 4,224.90 mi (6,799.32 km) |
| Niagara Falls to Klobuck | 4,296.47 mi (6,914.50 km) |
| Niagara Falls to Klodzko | 4,233.12 mi (6,812.55 km) |
