| Business | Phone |
| Geosyntec Consultants 8120 Main St, Dexter 48130 | (734) 426-0100 |
| J Zenas Consulting 6838 Daly Rd, Dexter 48130 | (734) 424-0567 |
| G C Walter Consulting 7439 Black Forest Dr, Dexter 48130 | (734) 426-0532 |
| Project Medtech Inc 6200 Marshall Rd, Dexter 48130 | (734) 213-0604 |
| W Jay Gillespie Consulting 12010 Jackson Rd, Dexter 48130 | (734) 475-3459 |