| Castle Rock to Joliet (Illinois) | 889.21 mi (1,431.04 km) |
| Castle Rock to Jonesboro (Arkansas) | 812.86 mi (1,308.18 km) |
| Castle Rock to Joplin (Missouri) | 583.54 mi (939.11 km) |
| Castle Rock to Joppatowne (Maryland) | 1,515.39 mi (2,438.79 km) |
| Castle Rock to Juana Díaz (Puerto Rico) | 2,720.75 mi (4,378.63 km) |
| Castle Rock to Junction City (Kansas) | 429.02 mi (690.43 km) |
| Castle Rock to Juneau (Alaska) | 1,845.72 mi (2,970.40 km) |
| Castle Rock to Jupiter (Florida) | 1,661.63 mi (2,674.13 km) |
| Castle Rock to Jupiter Farms (Florida) | 1,656.35 mi (2,665.64 km) |
| Castle Rock to Jurupa Valley (California) | 790.54 mi (1,272.25 km) |
| Castle Rock to Justice (Illinois) | 906.67 mi (1,459.15 km) |
| Castle Rock to Kahului (Hawaii) | 3,287.27 mi (5,290.35 km) |
| Castle Rock to Kailua (Hawaii) | 3,334.76 mi (5,366.77 km) |
| Castle Rock to Kalamazoo (Michigan) | 1,024.62 mi (1,648.97 km) |
| Castle Rock to Kalispell (Montana) | 770.91 mi (1,240.66 km) |
