| Hackettstown to Darby (Pennsylvania) | 68.41 mi (110.10 km) |
| Hackettstown to Dardenne Prairie (Missouri) | 855.39 mi (1,376.62 km) |
| Hackettstown to Darien (Illinois) | 685.02 mi (1,102.43 km) |
| Hackettstown to Davenport (Iowa) | 820.56 mi (1,320.56 km) |
| Hackettstown to Davidson (North Carolina) | 493.55 mi (794.30 km) |
| Hackettstown to Davie (Florida) | 1,067.68 mi (1,718.27 km) |
| Hackettstown to Davis (California) | 2,468.77 mi (3,973.10 km) |
| Hackettstown to Dayton (Nevada) | 2,342.67 mi (3,770.16 km) |
| Hackettstown to Dayton (Ohio) | 499.16 mi (803.32 km) |
| Hackettstown to Daytona Beach (Florida) | 879.35 mi (1,415.18 km) |
| Hackettstown to De Pere (Wisconsin) | 716.46 mi (1,153.04 km) |
| Hackettstown to De Witt (New York) | 163.62 mi (263.32 km) |
| Hackettstown to Dearborn (Michigan) | 444.82 mi (715.87 km) |
| Hackettstown to Dearborn Heights (Michigan) | 448.08 mi (721.12 km) |
| Hackettstown to DeBary (Florida) | 904.84 mi (1,456.20 km) |
