| Castle Rock to Kaneohe (Hawaii) | 3,336.90 mi (5,370.22 km) |
| Castle Rock to Kankakee (Illinois) | 902.48 mi (1,452.41 km) |
| Castle Rock to Kannapolis (North Carolina) | 1,351.28 mi (2,174.67 km) |
| Castle Rock to Kansas City (Kansas) | 540.90 mi (870.49 km) |
| Castle Rock to Kansas City (Missouri) | 551.05 mi (886.83 km) |
| Castle Rock to Kapaa (Hawaii) | 3,393.58 mi (5,461.44 km) |
| Castle Rock to Kapolei (Hawaii) | 3,354.22 mi (5,398.10 km) |
| Castle Rock to Katy (Texas) | 836.75 mi (1,346.63 km) |
| Castle Rock to Kaukauna (Wisconsin) | 916.73 mi (1,475.34 km) |
| Castle Rock to Kaysville (Utah) | 391.16 mi (629.51 km) |
| Castle Rock to Kearney (Missouri) | 560.22 mi (901.59 km) |
| Castle Rock to Kearney (Nebraska) | 318.59 mi (512.73 km) |
| Castle Rock to Kearns (Utah) | 388.68 mi (625.51 km) |
| Castle Rock to Kearny (New Jersey) | 1,619.61 mi (2,606.50 km) |
| Castle Rock to Keene (New Hampshire) | 1,700.40 mi (2,736.53 km) |
