| Castle Rock to Greenwood Village (Colorado) | 16.82 mi (27.06 km) |
| Castle Rock to Greer (South Carolina) | 1,279.31 mi (2,058.85 km) |
| Castle Rock to Grenada (Mississippi) | 918.12 mi (1,477.57 km) |
| Castle Rock to Gresham (Oregon) | 988.85 mi (1,591.41 km) |
| Castle Rock to Gretna (Louisiana) | 1,063.26 mi (1,711.16 km) |
| Castle Rock to Griffin (Georgia) | 1,218.27 mi (1,960.62 km) |
| Castle Rock to Griffith (Indiana) | 926.72 mi (1,491.41 km) |
| Castle Rock to Grimes (Iowa) | 601.67 mi (968.30 km) |
| Castle Rock to Grosse Pointe Park (Michigan) | 1,160.65 mi (1,867.88 km) |
| Castle Rock to Grosse Pointe Woods (Michigan) | 1,162.38 mi (1,870.68 km) |
| Castle Rock to Grove City (Ohio) | 1,157.02 mi (1,862.04 km) |
| Castle Rock to Groveland (Florida) | 1,508.04 mi (2,426.96 km) |
| Castle Rock to Grover Beach (California) | 914.17 mi (1,471.21 km) |
| Castle Rock to Groves (Texas) | 899.12 mi (1,446.99 km) |
| Castle Rock to Groveton (Virginia) | 1,483.64 mi (2,387.68 km) |
