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From the USDA - ERS, this site provides state and county-level data on population, poverty, education, employment, unemployment, and median household income.
Databases - Not for Commercial Use
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.
Market research reports from leading research firms, as well as reports from MarketLooks. Subjects covered include consumer & personal products, demographics, engineering & construction, food & beverage, and more.
Library Reference Sources
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.
2014 ed. of this source presents data on consumer spending, including apparel, entertainment, financial products and services, health care, gifts, housing, and transportation. Provides an overview of spending trends.
Statistical information on the attitudes and behavior, education, health, income, labor force, living arrangements, popoulation, spending and wealth of young adults born from 1977 to 1994. Published in 2015.