Click on "Local Market Audience Analyst" once you have accessed "SRDS Media Solutions."
Although the databases below are not for commercial use, you may be able to get some leads. For example, if you identify an association used in a report, go to that association's website and you might be able to obtain freely available information to use in your analysis.
When doing market research the investigator, at the very least, wants to find out demographics, income, and who is spending money on a product. The sources here will help with this process.