| Hackettstown to Oswego (Illinois) | 703.29 mi (1,131.84 km) |
| Hackettstown to Oswego (New York) | 198.91 mi (320.12 km) |
| Hackettstown to Otsego (Minnesota) | 993.85 mi (1,599.44 km) |
| Hackettstown to Ottawa (Illinois) | 728.92 mi (1,173.09 km) |
| Hackettstown to Ottawa (Kansas) | 1,094.62 mi (1,761.62 km) |
| Hackettstown to Ottumwa (Iowa) | 916.78 mi (1,475.42 km) |
| Hackettstown to Overland (Missouri) | 837.56 mi (1,347.92 km) |
| Hackettstown to Overland Park (Kansas) | 1,059.63 mi (1,705.31 km) |
| Hackettstown to Overlea (Maryland) | 136.33 mi (219.41 km) |
| Hackettstown to Oviedo (Florida) | 916.10 mi (1,474.32 km) |
| Hackettstown to Owasso (Oklahoma) | 1,174.51 mi (1,890.19 km) |
| Hackettstown to Owatonna (Minnesota) | 962.08 mi (1,548.31 km) |
| Hackettstown to Owensboro (Kentucky) | 690.38 mi (1,111.06 km) |
| Hackettstown to Owings Mills (Maryland) | 143.92 mi (231.62 km) |
| Hackettstown to Owosso (Michigan) | 502.61 mi (808.87 km) |
