| Hackettstown to Silver Firs (Washington) | 2,349.08 mi (3,780.48 km) |
| Hackettstown to Silver Spring (Maryland) | 172.86 mi (278.19 km) |
| Hackettstown to Silver Springs Shores (Florida) | 906.78 mi (1,459.32 km) |
| Hackettstown to Silverdale (Washington) | 2,375.19 mi (3,822.50 km) |
| Hackettstown to Silverton (Oregon) | 2,407.30 mi (3,874.18 km) |
| Hackettstown to Simi Valley (California) | 2,422.49 mi (3,898.62 km) |
| Hackettstown to Simpsonville (South Carolina) | 585.85 mi (942.83 km) |
| Hackettstown to Sioux City (Iowa) | 1,115.62 mi (1,795.42 km) |
| Hackettstown to Sioux Falls (South Dakota) | 1,133.11 mi (1,823.57 km) |
| Hackettstown to Skokie (Illinois) | 673.16 mi (1,083.35 km) |
| Hackettstown to Sleepy Hollow (New York) | 52.42 mi (84.37 km) |
| Hackettstown to Slidell (Louisiana) | 1,110.42 mi (1,787.04 km) |
| Hackettstown to Smithfield (North Carolina) | 415.58 mi (668.82 km) |
| Hackettstown to Smithfield (Utah) | 1,905.56 mi (3,066.71 km) |
| Hackettstown to Smithville (Missouri) | 1,046.04 mi (1,683.44 km) |
