| Castle Rock to Dumas (Texas) | 289.76 mi (466.33 km) |
| Castle Rock to Dumont (New Jersey) | 1,624.72 mi (2,614.74 km) |
| Castle Rock to Duncan (Oklahoma) | 507.74 mi (817.12 km) |
| Castle Rock to Duncanville (Texas) | 642.27 mi (1,033.64 km) |
| Castle Rock to Dundalk (Maryland) | 1,509.51 mi (2,429.31 km) |
| Castle Rock to Dunedin (Florida) | 1,484.81 mi (2,389.56 km) |
| Castle Rock to Dunkirk (New York) | 1,344.17 mi (2,163.23 km) |
| Castle Rock to Dunmore (Pennsylvania) | 1,538.05 mi (2,475.25 km) |
| Castle Rock to Dunwoody (Georgia) | 1,195.70 mi (1,924.29 km) |
| Castle Rock to Durango (Colorado) | 219.39 mi (353.07 km) |
| Castle Rock to Durant (Oklahoma) | 597.88 mi (962.20 km) |
| Castle Rock to Durham (North Carolina) | 1,433.32 mi (2,306.70 km) |
| Castle Rock to Dyer (Indiana) | 922.20 mi (1,484.14 km) |
| Castle Rock to Dyersburg (Tennessee) | 875.38 mi (1,408.79 km) |
| Castle Rock to Eagan (Minnesota) | 706.40 mi (1,136.83 km) |
