| Business Name | Address | |
| Electrical Systems | 305 Seaton Cir Spearfish, SD 57783 |
 |
| Grosfield Electric Co | 422 Aviation Pl Spearfish, SD 57783 |
|
| Heartland Services | Spearfish, SD 57783 |
|
| Royal Electric | 821 N Rainbow Rd Spearfish, SD 57783 |
|
| Scott's Electric | 7 Jerry Rd Spearfish, SD 57783 |
|