| Hackettstown to Oakley (California) | 2,479.47 mi (3,990.32 km) |
| Hackettstown to Oakton (Virginia) | 188.87 mi (303.95 km) |
| Hackettstown to Oakville (Missouri) | 839.67 mi (1,351.32 km) |
| Hackettstown to Oatfield (Oregon) | 2,393.35 mi (3,851.73 km) |
| Hackettstown to Ocala (Florida) | 906.14 mi (1,458.30 km) |
| Hackettstown to Ocean Acres (New Jersey) | 81.96 mi (131.91 km) |
| Hackettstown to Ocean City (New Jersey) | 110.21 mi (177.37 km) |
| Hackettstown to Ocean Pines (Maryland) | 171.45 mi (275.92 km) |
| Hackettstown to Ocean Pointe (Hawaii) | 4,924.06 mi (7,924.50 km) |
| Hackettstown to Ocean Springs (Mississippi) | 1,063.09 mi (1,710.88 km) |
| Hackettstown to Oceanside (California) | 2,377.29 mi (3,825.88 km) |
| Hackettstown to Oceanside (New York) | 64.11 mi (103.17 km) |
| Hackettstown to Ocoee (Florida) | 928.95 mi (1,494.99 km) |
| Hackettstown to Oconomowoc (Wisconsin) | 718.17 mi (1,155.79 km) |
| Hackettstown to Odenton (Maryland) | 158.26 mi (254.69 km) |
