| Castle Rock to Anoka (Minnesota) | 710.08 mi (1,142.77 km) |
| Castle Rock to Ansonia (Connecticut) | 1,669.54 mi (2,686.87 km) |
| Castle Rock to Antelope (California) | 885.75 mi (1,425.47 km) |
| Castle Rock to Anthem (Arizona) | 554.36 mi (892.16 km) |
| Castle Rock to Antioch (California) | 917.59 mi (1,476.72 km) |
| Castle Rock to Antioch (Illinois) | 900.18 mi (1,448.71 km) |
| Castle Rock to Apache Junction (Arizona) | 555.27 mi (893.61 km) |
| Castle Rock to Apex (North Carolina) | 1,440.14 mi (2,317.68 km) |
| Castle Rock to Apollo Beach (Florida) | 1,514.91 mi (2,438.00 km) |
| Castle Rock to Apopka (Florida) | 1,518.86 mi (2,444.37 km) |
| Castle Rock to Apple Valley (California) | 758.94 mi (1,221.40 km) |
| Castle Rock to Apple Valley (Minnesota) | 702.50 mi (1,130.57 km) |
| Castle Rock to Appleton (Wisconsin) | 910.80 mi (1,465.79 km) |
| Castle Rock to Arbutus (Maryland) | 1,499.36 mi (2,412.99 km) |
| Castle Rock to Arcadia (California) | 813.63 mi (1,309.40 km) |
