| Boulder to Kamen | 4,934.37 mi (7,941.11 km) |
| Boulder to Kamenz | 5,149.20 mi (8,286.84 km) |
| Boulder to Kamp-Lintfort | 4,902.19 mi (7,889.30 km) |
| Boulder to Kandel | 5,068.62 mi (8,157.16 km) |
| Boulder to Kappeln | 4,861.23 mi (7,823.40 km) |
| Boulder to Karben | 5,033.21 mi (8,100.17 km) |
| Boulder to Karlsdorf-Neuthard | 5,077.51 mi (8,171.46 km) |
| Boulder to Karlsfeld | 5,217.52 mi (8,396.79 km) |
| Boulder to Karlsruhe | 5,078.88 mi (8,173.66 km) |
| Boulder to Kassel | 5,005.40 mi (8,055.41 km) |
| Boulder to Kaufbeuren | 5,206.26 mi (8,378.66 km) |
| Boulder to Kaufering | 5,204.97 mi (8,376.59 km) |
| Boulder to Kaufungen | 5,010.84 mi (8,064.17 km) |
| Boulder to Kehl | 5,080.07 mi (8,175.58 km) |
| Boulder to Kelheim | 5,196.16 mi (8,362.41 km) |
