| Hackettstown to Smyrna (Delaware) | 115.49 mi (185.86 km) |
| Hackettstown to Smyrna (Georgia) | 717.88 mi (1,155.31 km) |
| Hackettstown to Smyrna (Tennessee) | 716.92 mi (1,153.77 km) |
| Hackettstown to Snellville (Georgia) | 697.71 mi (1,122.85 km) |
| Hackettstown to Snoqualmie (Washington) | 2,337.30 mi (3,761.52 km) |
| Hackettstown to Snyder (Texas) | 1,541.96 mi (2,481.55 km) |
| Hackettstown to Socastee (South Carolina) | 545.81 mi (878.39 km) |
| Hackettstown to Socorro (Texas) | 1,851.73 mi (2,980.06 km) |
| Hackettstown to Soddy-Daisy (Tennessee) | 682.25 mi (1,097.97 km) |
| Hackettstown to Solana Beach (California) | 2,381.48 mi (3,832.62 km) |
| Hackettstown to Soledad (California) | 2,499.02 mi (4,021.78 km) |
| Hackettstown to Solon (Ohio) | 346.15 mi (557.07 km) |
| Hackettstown to Somers Point (New Jersey) | 106.85 mi (171.95 km) |
| Hackettstown to Somerset (Kentucky) | 586.19 mi (943.39 km) |
| Hackettstown to Somerset (New Jersey) | 29.33 mi (47.19 km) |
