| Castle Rock to Grovetown (Georgia) | 1,319.92 mi (2,124.20 km) |
| Castle Rock to Guayama (Puerto Rico) | 2,743.91 mi (4,415.89 km) |
| Castle Rock to Guaynabo (Puerto Rico) | 2,725.37 mi (4,386.06 km) |
| Castle Rock to Gulf Shores (Alabama) | 1,155.19 mi (1,859.11 km) |
| Castle Rock to Gulfport (Florida) | 1,500.63 mi (2,415.03 km) |
| Castle Rock to Gulfport (Mississippi) | 1,084.67 mi (1,745.61 km) |
| Castle Rock to Gunbarrel (Colorado) | 50.38 mi (81.07 km) |
| Castle Rock to Gurnee (Illinois) | 905.93 mi (1,457.95 km) |
| Castle Rock to Guthrie (Oklahoma) | 473.49 mi (762.01 km) |
| Castle Rock to Guttenberg (New Jersey) | 1,625.27 mi (2,615.62 km) |
| Castle Rock to Guymon (Oklahoma) | 261.11 mi (420.21 km) |
| Castle Rock to Hacienda Heights (California) | 815.26 mi (1,312.04 km) |
| Castle Rock to Hackensack (New Jersey) | 1,622.36 mi (2,610.94 km) |
| Castle Rock to Hackettstown (New Jersey) | 1,582.15 mi (2,546.23 km) |
| Castle Rock to Hagerstown (Maryland) | 1,440.91 mi (2,318.92 km) |
