| Niederkassel to Dover (New Jersey) | 3,782.60 mi (6,087.50 km) |
| Niederkassel to Dover (Ohio) | 4,071.26 mi (6,552.07 km) |
| Niederkassel to Downers Grove (Illinois) | 4,258.37 mi (6,853.18 km) |
| Niederkassel to Downey (California) | 5,698.84 mi (9,171.39 km) |
| Niederkassel to Dranesville (Virginia) | 3,980.60 mi (6,406.15 km) |
| Niederkassel to Draper (Utah) | 5,131.12 mi (8,257.75 km) |
| Niederkassel to Drexel Heights (Arizona) | 5,579.82 mi (8,979.86 km) |
| Niederkassel to Drexel Hill (Pennsylvania) | 3,854.35 mi (6,202.97 km) |
| Niederkassel to Duarte (California) | 5,680.29 mi (9,141.54 km) |
| Niederkassel to Dublin (California) | 5,581.72 mi (8,982.92 km) |
| Niederkassel to Dublin (Georgia) | 4,514.50 mi (7,265.38 km) |
| Niederkassel to Dublin (Ohio) | 4,155.25 mi (6,687.23 km) |
| Niederkassel to Dubuque (Iowa) | 4,321.97 mi (6,955.53 km) |
| Niederkassel to Duluth (Georgia) | 4,490.72 mi (7,227.12 km) |
| Niederkassel to Duluth (Minnesota) | 4,164.57 mi (6,702.24 km) |
