| Business | Phone |
| American Technology Research 10 Glenville St, Greenwich 6831 | (203) 532-7300 |
| American Technology Research 53 Forest Ave, Greenwich 6830 | (203) 637-2622 |
| Variant Research Group 1 Sound Shore Dr # 101, Greenwich 6830 | (203) 422-0611 |
| Cos Cob Research 75 E Putnam Ave, Greenwich 6830 | (203) 622-9219 |
| Research Usa 17 Mortimer Dr, Greenwich 6830 | (203) 637-2699 |
| Madar Research Corp 45 E Putnam Ave, Greenwich 6830 | (203) 622-9192 |