| Castle Rock to Ashtabula (Ohio) | 1,268.97 mi (2,042.21 km) |
| Castle Rock to Ashwaubenon (Wisconsin) | 928.94 mi (1,494.99 km) |
| Castle Rock to Aspen Hill (Maryland) | 1,480.45 mi (2,382.55 km) |
| Castle Rock to Astoria (Oregon) | 1,066.41 mi (1,716.22 km) |
| Castle Rock to Atascadero (California) | 907.96 mi (1,461.21 km) |
| Castle Rock to Atascocita (Texas) | 849.10 mi (1,366.50 km) |
| Castle Rock to Atchison (Kansas) | 518.18 mi (833.93 km) |
| Castle Rock to Athens (Alabama) | 1,034.53 mi (1,664.91 km) |
| Castle Rock to Athens (Georgia) | 1,244.84 mi (2,003.38 km) |
| Castle Rock to Athens (Ohio) | 1,212.50 mi (1,951.33 km) |
| Castle Rock to Athens (Tennessee) | 1,141.04 mi (1,836.32 km) |
| Castle Rock to Athens (Texas) | 707.23 mi (1,138.18 km) |
| Castle Rock to Atlanta (Georgia) | 1,195.10 mi (1,923.33 km) |
| Castle Rock to Atlantic Beach (Florida) | 1,462.59 mi (2,353.81 km) |
| Castle Rock to Atlantic City (New Jersey) | 1,615.85 mi (2,600.45 km) |
