| Hackettstown to Decatur (Alabama) | 792.82 mi (1,275.93 km) |
| Hackettstown to Decatur (Georgia) | 713.56 mi (1,148.37 km) |
| Hackettstown to Decatur (Illinois) | 745.23 mi (1,199.33 km) |
| Hackettstown to Deer Park (New York) | 78.90 mi (126.98 km) |
| Hackettstown to Deer Park (Texas) | 1,374.74 mi (2,212.44 km) |
| Hackettstown to Deerfield (Illinois) | 679.34 mi (1,093.30 km) |
| Hackettstown to Deerfield Beach (Florida) | 1,049.98 mi (1,689.78 km) |
| Hackettstown to Defiance (Ohio) | 497.58 mi (800.78 km) |
| Hackettstown to DeForest (Wisconsin) | 761.74 mi (1,225.91 km) |
| Hackettstown to DeKalb (Illinois) | 724.67 mi (1,166.24 km) |
| Hackettstown to Del Aire (California) | 2,412.60 mi (3,882.70 km) |
| Hackettstown to Del City (Oklahoma) | 1,280.09 mi (2,060.11 km) |
| Hackettstown to Del Rio (Texas) | 1,663.56 mi (2,677.24 km) |
| Hackettstown to DeLand (Florida) | 894.99 mi (1,440.34 km) |
| Hackettstown to Delano (California) | 2,408.68 mi (3,876.39 km) |
