| Business | Phone |
| Brotherhood-Locomotive Engrs 400 S Kendrick Ave, Gillette 82716 | (307) 682-5031 |
| Consolidated Engineers Inc 316 1/2 S Gillette Ave, Gillette 82716 | (307) 682-0768 |
| Knight Technologies Inc 201 W Lakeway Rd 200, Gillette 82718 | (307) 682-8547 |
| Lowham Engineering 701 N Highway 14 16, Gillette 82716 | (307) 685-3137 |