| Niagara Falls to Kluczbork | 4,268.26 mi (6,869.10 km) |
| Niagara Falls to Knurow | 4,315.40 mi (6,944.97 km) |
| Niagara Falls to Kobylka | 4,318.77 mi (6,950.38 km) |
| Niagara Falls to Kokoszki | 4,147.54 mi (6,674.82 km) |
| Niagara Falls to Kolbuszowa | 4,424.04 mi (7,119.80 km) |
| Niagara Falls to Kolno | 4,299.94 mi (6,920.08 km) |
| Niagara Falls to Kolo | 4,235.32 mi (6,816.09 km) |
| Niagara Falls to Kolobrzeg | 4,054.84 mi (6,525.64 km) |
| Niagara Falls to Koluszki | 4,293.84 mi (6,910.26 km) |
| Niagara Falls to Komorniki | 4,164.78 mi (6,702.56 km) |
| Niagara Falls to Konin | 4,221.84 mi (6,794.40 km) |
| Niagara Falls to Konskie | 4,337.53 mi (6,980.59 km) |
| Niagara Falls to Konstancin-Jeziorna | 4,326.04 mi (6,962.09 km) |
| Niagara Falls to Konstantynow Lodzki | 4,277.51 mi (6,883.99 km) |
| Niagara Falls to Koronowo | 4,167.97 mi (6,707.70 km) |
