| Castle Rock to Dover (New Jersey) | 1,595.73 mi (2,568.08 km) |
| Castle Rock to Dover (Ohio) | 1,236.87 mi (1,990.56 km) |
| Castle Rock to Downers Grove (Illinois) | 897.56 mi (1,444.49 km) |
| Castle Rock to Downey (California) | 825.15 mi (1,327.95 km) |
| Castle Rock to Dranesville (Virginia) | 1,466.42 mi (2,359.97 km) |
| Castle Rock to Draper (Utah) | 379.08 mi (610.07 km) |
| Castle Rock to Drexel Heights (Arizona) | 608.10 mi (978.64 km) |
| Castle Rock to Drexel Hill (Pennsylvania) | 1,565.00 mi (2,518.62 km) |
| Castle Rock to Duarte (California) | 808.40 mi (1,300.99 km) |
| Castle Rock to Dublin (California) | 926.67 mi (1,491.33 km) |
| Castle Rock to Dublin (Georgia) | 1,310.00 mi (2,108.24 km) |
| Castle Rock to Dublin (Ohio) | 1,151.53 mi (1,853.21 km) |
| Castle Rock to Dubuque (Iowa) | 768.20 mi (1,236.31 km) |
| Castle Rock to Duluth (Georgia) | 1,202.43 mi (1,935.12 km) |
| Castle Rock to Duluth (Minnesota) | 818.69 mi (1,317.55 km) |
