Focus Group Companies
Focus group companies are also called Market Research companies. My favorite resource for finding focus group company listings is theGreenbook. It’s a free directory that has a listing of focus group facilities for US states as well as international locations.
You can do a basic search by location or a power search, that allows you to search from more options. For the state search, just type in the state abbreviation or city name for some of the larger, more well know cities.
Most sites that you will find here will let you apply directly on their site. Most times, there will be a registration link or sign up link on the top of their page, or in some cases, the very bottom. If you do not find a registration link, just email the company, asking how to register for focus groups.