| Harker Heights to Silver Firs (Washington) | 1,734.71 mi (2,791.74 km) |
| Harker Heights to Silver Spring (Maryland) | 1,285.54 mi (2,068.88 km) |
| Harker Heights to Silver Springs Shores (Florida) | 943.22 mi (1,517.97 km) |
| Harker Heights to Silverdale (Washington) | 1,748.25 mi (2,813.53 km) |
| Harker Heights to Silverton (Oregon) | 1,661.95 mi (2,674.66 km) |
| Harker Heights to Simi Valley (California) | 1,245.10 mi (2,003.79 km) |
| Harker Heights to Simpsonville (South Carolina) | 926.99 mi (1,491.84 km) |
| Harker Heights to Sioux City (Iowa) | 793.35 mi (1,276.78 km) |
| Harker Heights to Sioux Falls (South Dakota) | 863.89 mi (1,390.30 km) |
| Harker Heights to Skokie (Illinois) | 935.39 mi (1,505.36 km) |
| Harker Heights to Sleepy Hollow (New York) | 1,490.87 mi (2,399.32 km) |
| Harker Heights to Slidell (Louisiana) | 470.11 mi (756.56 km) |
| Harker Heights to Smithfield (North Carolina) | 1,154.04 mi (1,857.25 km) |
| Harker Heights to Smithfield (Utah) | 1,081.60 mi (1,740.67 km) |
| Harker Heights to Smithville (Missouri) | 601.26 mi (967.64 km) |
