Demographics are the physical characteristics of a population, such as age, sex, marital status, family size, education, geographic location, and occupation. Demographic data is available from many sources, including government agencies and private commercial sources.
The primary source for demographic information in the United States is the United States Census Bureau and its reports based on the decennial census
U.S. Census Comprehensive Resources
US Census Business Builder - Provides easy access to selected demographic and economic data from the Census Bureau about potential customers and similar businesses for those starting or planning a business.
Census Business Builder - Regional Analyst Edition - Provides a broad portrait of the people and businesses in their service area. Presents data for all sectors of the economy and a user-defined region made up of one or more locations.
American Time Use Survey (BLS) - measures the time people spend doing various activities, such as paid work, childcare, volunteering, and socializing.
Consumer Expenditure Survey - identifies the buying habits of American consumers, including data on their expenditures, income, and consumer unit (families and single consumers characteristics).