| Niagara Falls to Karlskoga | 3,842.92 mi (6,184.59 km) |
| Niagara Falls to Karlskrona | 3,984.46 mi (6,412.37 km) |
| Niagara Falls to Karlstad | 3,809.89 mi (6,131.42 km) |
| Niagara Falls to Katrineholm | 3,906.27 mi (6,286.54 km) |
| Niagara Falls to Kavlinge | 3,914.12 mi (6,299.17 km) |
| Niagara Falls to Kinna | 3,843.02 mi (6,184.74 km) |
| Niagara Falls to Kiruna | 3,729.15 mi (6,001.49 km) |
| Niagara Falls to Klippansbruk | 3,904.54 mi (6,283.75 km) |
| Niagara Falls to Koping | 3,882.22 mi (6,247.83 km) |
| Niagara Falls to Kristianstad | 3,940.41 mi (6,341.48 km) |
| Niagara Falls to Kristinehamn | 3,831.53 mi (6,166.25 km) |
| Niagara Falls to Kumla | 3,869.21 mi (6,226.89 km) |
| Niagara Falls to Kungalv | 3,808.39 mi (6,129.01 km) |
| Niagara Falls to Kungsangen | 3,937.27 mi (6,336.42 km) |
| Niagara Falls to Kungsbacka | 3,823.81 mi (6,153.83 km) |
