| Hackettstown to Odessa (Texas) | 1,643.15 mi (2,644.39 km) |
| Hackettstown to Ogden (Utah) | 1,920.84 mi (3,091.29 km) |
| Hackettstown to Oildale (California) | 2,405.41 mi (3,871.13 km) |
| Hackettstown to Ojus (Florida) | 1,073.76 mi (1,728.05 km) |
| Hackettstown to Okemos (Michigan) | 509.98 mi (820.73 km) |
| Hackettstown to Oklahoma City (Oklahoma) | 1,283.31 mi (2,065.28 km) |
| Hackettstown to Okmulgee (Oklahoma) | 1,201.72 mi (1,933.98 km) |
| Hackettstown to Olathe (Kansas) | 1,066.64 mi (1,716.59 km) |
| Hackettstown to Old Jamestown (Missouri) | 830.65 mi (1,336.80 km) |
| Hackettstown to Oldsmar (Florida) | 990.04 mi (1,593.32 km) |
| Hackettstown to Olean (New York) | 205.06 mi (330.02 km) |
| Hackettstown to Olive Branch (Mississippi) | 912.81 mi (1,469.03 km) |
| Hackettstown to Olivehurst (California) | 2,448.03 mi (3,939.72 km) |
| Hackettstown to Olney (Maryland) | 167.46 mi (269.51 km) |
| Hackettstown to Olympia (Washington) | 2,390.47 mi (3,847.09 km) |
