| Business | Phone |
| International Union-Engineers 4086 Dolan Dr, Flint 48504 | (810) 785-3481 |
| Bquad Engineering Inc 4441 S Saginaw St, Flint 48507 | (810) 743-1700 |
| Engineering Design Assoc 2016 Robert T Longway Blvd, Flint 48503 | (810) 239-4801 |
| Michigan Professional Engrg 3401 Corunna Rd, Flint 48503 | (810) 235-5000 |