| Business | Phone |
| Industrial Finish Engineering 308 Town Center Dr, Troy 48084 | (248) 641-1768 |
| Isotech Engineering 3250 W Big Beaver Rd, Troy 48084 | (248) 643-9700 |
| M & T Design Svc 645 Executive Dr, Troy 48083 | (248) 585-4162 |
| Kelly Engineering Resources 901 Wilshire Dr, Troy 48084 | (248) 404-9558 |
| Kelly Engineering Search 901 Wilshire Dr # 130, Troy 48084 | (248) 404-9564 |
| Klep Corp 2922 Industrial Row Dr, Troy 48084 | (248) 435-6590 |
| Alfmeier Corp Engineering Div 50 W Big Beaver Rd, Troy 48084 | (248) 526-1650 |
| Altair Engineering 950 Highway 7 S, Troy 48083 | (662) 252-6338 |
| Vest Inc 3250 W Big Beaver Rd 440, Troy 48084 | (248) 649-9550 |
| Ast Engineering Inc 2145 Crooks Rd, Troy 48084 | (248) 614-6938 |
| Tsubaki Detroit Engineering 560 Kirts Blvd 109, Troy 48084 | (248) 362-5052 |
| Autoview Control 318 Coachman Dr, Troy 48083 | (248) 740-4887 |
| Lean Technical Svc Llc 527 Executive Dr, Troy 48083 | (248) 577-0300 |
| Engineering Technology Asso 1133 E Maple Rd, Troy 48083 | (248) 729-3010 |
| Ove Arup & Partners Detroit 1625 W Big Beaver Rd, Troy 48084 | (248) 822-5050 |
| General Motors Corp 1870 Technology Dr, Troy 48083 | (248) 680-5315 |
| Meridian 671 E Big Beaver Rd # 201, Troy 48083 | (248) 526-0444 |
| Altair Engineering 1820 E Big Beaver Rd, Troy 48083 | (248) 432-7548 |
| Meridian 675 E Big Beaver Rd # 107, Troy 48083 | (248) 526-0444 |
| Efficient Engineering Co Inc 130 Town Center Dr, Troy 48084 | (248) 528-2887 |
| Pgk Engineering 1450 W Long Lake Rd, Troy 48098 | (248) 290-0500 |