| Hackettstown to South Plainfield (New Jersey) | 28.88 mi (46.48 km) |
| Hackettstown to South Portland (Maine) | 301.00 mi (484.42 km) |
| Hackettstown to South Riding (Virginia) | 195.70 mi (314.95 km) |
| Hackettstown to South River (New Jersey) | 36.70 mi (59.06 km) |
| Hackettstown to South Salt Lake (Utah) | 1,924.90 mi (3,097.82 km) |
| Hackettstown to South San Francisco (California) | 2,524.63 mi (4,063.00 km) |
| Hackettstown to South San Jose Hills (California) | 2,385.60 mi (3,839.25 km) |
| Hackettstown to South Sioux City (Nebraska) | 1,116.82 mi (1,797.35 km) |
| Hackettstown to South St. Paul (Minnesota) | 961.19 mi (1,546.88 km) |
| Hackettstown to South Valley (New Mexico) | 1,771.95 mi (2,851.68 km) |
| Hackettstown to South Venice (Florida) | 1,047.56 mi (1,685.89 km) |
| Hackettstown to South Whittier (California) | 2,394.46 mi (3,853.52 km) |
| Hackettstown to South Yarmouth (Massachusetts) | 246.70 mi (397.03 km) |
| Hackettstown to Southaven (Mississippi) | 919.55 mi (1,479.88 km) |
| Hackettstown to Southchase (Florida) | 938.53 mi (1,510.43 km) |
