Use existing data that others have gathered to learn as much as you can about your target market.
U.S. Census Bureau American FactFinder
This resource provides a wealth of demographic information about people, geography, and businesses that will help you as you start a business. Enter a state, city, county, or zip code into the Community Facts box at the top of the page and then take a look at some of the options in the left-hand column to find out about a community's population, age, education, income, and other data.
Consumer Expenditure Survey
Provides information on the buying habits of American consumers.