| Castle Rock to Kenosha (Wisconsin) | 911.11 mi (1,466.29 km) |
| Castle Rock to Kent (Ohio) | 1,240.87 mi (1,996.99 km) |
| Castle Rock to Kent (Washington) | 1,029.10 mi (1,656.18 km) |
| Castle Rock to Kentwood (Michigan) | 1,028.78 mi (1,655.66 km) |
| Castle Rock to Kerman (California) | 846.43 mi (1,362.20 km) |
| Castle Rock to Kernersville (North Carolina) | 1,367.62 mi (2,200.97 km) |
| Castle Rock to Kerrville (Texas) | 721.91 mi (1,161.80 km) |
| Castle Rock to Kettering (Maryland) | 1,498.41 mi (2,411.46 km) |
| Castle Rock to Kettering (Ohio) | 1,101.02 mi (1,771.91 km) |
| Castle Rock to Kewanee (Illinois) | 795.93 mi (1,280.93 km) |
| Castle Rock to Key Biscayne (Florida) | 1,712.00 mi (2,755.21 km) |
| Castle Rock to Key Largo (Florida) | 1,725.58 mi (2,777.06 km) |
| Castle Rock to Key West (Florida) | 1,687.48 mi (2,715.73 km) |
| Castle Rock to Keystone (Florida) | 1,489.71 mi (2,397.45 km) |
| Castle Rock to Kihei (Hawaii) | 3,290.68 mi (5,295.84 km) |
