| Business | Phone |
| J D Power & Assoc 5435 Corporate Dr 300, Troy 48098 | (248) 267-6800 |
| Unisearch Partners 1323 Bradbury Dr, Troy 48098 | (248) 952-5030 |
| Consumer Insights 5455 Corporate Dr, Troy 48098 | (248) 952-1600 |
| Cultural Connection 6295 Sandshores Dr, Troy 48085 | (248) 879-9619 |
| E Friedman Marketing Svc 350 W 14 Mile Rd, Troy 48083 | (248) 589-0950 |