| Castle Rock to Altus (Oklahoma) | 447.03 mi (719.43 km) |
| Castle Rock to Alum Rock (California) | 928.23 mi (1,493.84 km) |
| Castle Rock to Alvin (Texas) | 878.33 mi (1,413.54 km) |
| Castle Rock to Amarillo (Texas) | 333.00 mi (535.91 km) |
| Castle Rock to Amelia (Ohio) | 1,102.53 mi (1,774.34 km) |
| Castle Rock to American Canyon (California) | 939.66 mi (1,512.24 km) |
| Castle Rock to American Fork (Utah) | 374.43 mi (602.58 km) |
| Castle Rock to Americus (Georgia) | 1,258.52 mi (2,025.40 km) |
| Castle Rock to Ames (Iowa) | 615.61 mi (990.73 km) |
| Castle Rock to Amherst (Ohio) | 1,195.31 mi (1,923.67 km) |
| Castle Rock to Ammon (Idaho) | 464.04 mi (746.81 km) |
| Castle Rock to Amsterdam (New York) | 1,604.86 mi (2,582.78 km) |
| Castle Rock to Anacortes (Washington) | 1,081.38 mi (1,740.31 km) |
| Castle Rock to Anaheim (California) | 815.29 mi (1,312.08 km) |
| Castle Rock to Anchorage (Alaska) | 2,392.88 mi (3,850.97 km) |
