| Business | Phone |
| Advanced Engineering 804 South St, Rapid City 57701 | (605) 718-8825 |
| Bareis Engineering Inc 2465 W Chicago St, Rapid City 57702 | (605) 343-0222 |
| Centerline 731 Saint Joseph St # 120, Rapid City 57701 | (605) 341-3193 |
| Cetec Engineering Svc Inc 1830 W Fulton St, Rapid City 57702 | (605) 341-7800 |
| Davis Engineering 1060 Kings Rd, Rapid City 57702 | (605) 341-3095 |