| Hackettstown to Delaware (Ohio) | 434.53 mi (699.31 km) |
| Hackettstown to Delhi (California) | 2,445.46 mi (3,935.59 km) |
| Hackettstown to Delray Beach (Florida) | 1,039.38 mi (1,672.72 km) |
| Hackettstown to Deltona (Florida) | 900.83 mi (1,449.75 km) |
| Hackettstown to Deming (New Mexico) | 1,908.38 mi (3,071.25 km) |
| Hackettstown to Denison (Texas) | 1,287.51 mi (2,072.06 km) |
| Hackettstown to Dent (Ohio) | 532.56 mi (857.07 km) |
| Hackettstown to Denton (Texas) | 1,334.26 mi (2,147.29 km) |
| Hackettstown to Dentsville (South Carolina) | 576.13 mi (927.20 km) |
| Hackettstown to Denver (Colorado) | 1,577.33 mi (2,538.47 km) |
| Hackettstown to Depew (New York) | 244.95 mi (394.21 km) |
| Hackettstown to Derby (Connecticut) | 96.43 mi (155.18 km) |
| Hackettstown to Derby (Kansas) | 1,218.74 mi (1,961.38 km) |
| Hackettstown to Des Moines (Iowa) | 975.70 mi (1,570.23 km) |
| Hackettstown to Des Moines (Washington) | 2,360.40 mi (3,798.70 km) |
