| Niagara Falls to Juprelle | 3,804.25 mi (6,122.36 km) |
| Niagara Falls to Jurbise | 3,747.62 mi (6,031.21 km) |
| Niagara Falls to Kalmthout | 3,742.06 mi (6,022.27 km) |
| Niagara Falls to Kampenhout | 3,758.98 mi (6,049.49 km) |
| Niagara Falls to Kapelle-op-den-Bos | 3,749.53 mi (6,034.28 km) |
| Niagara Falls to Kapellen | 3,742.83 mi (6,023.50 km) |
| Niagara Falls to Kasterlee | 3,764.85 mi (6,058.94 km) |
| Niagara Falls to Keerbergen | 3,760.21 mi (6,051.48 km) |
| Niagara Falls to Kinrooi | 3,798.61 mi (6,113.27 km) |
| Niagara Falls to Knokke-Heist | 3,697.66 mi (5,950.80 km) |
| Niagara Falls to Koekelare | 3,693.26 mi (5,943.73 km) |
| Niagara Falls to Koekelberg | 3,752.88 mi (6,039.68 km) |
| Niagara Falls to Koksijde | 3,680.07 mi (5,922.50 km) |
| Niagara Falls to Kontich | 3,749.14 mi (6,033.66 km) |
| Niagara Falls to Kortemark | 3,697.64 mi (5,950.77 km) |
