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The Economic Census (done every five years) is a state-by-state overview of American industry statistics. Data from the 2007 census is available, and the 2012 Economic Census figures are being released in stages.
These programs "cover most of the country's economic activity," and the series are "useful for studying the economic activity of small areas; analyzing economic changes over time; and as a benchmark for statistical series, surveys, and databases between economic censuses. Businesses use the data for analyzing market potential, measuring the effectiveness of sales and advertising programs, setting sales quotas, and developing budgets."
A directory to all of the Census Bureau's economic programs, including the Economic Census, Minority- and Women-Owned Business, multi-sector data such as E-Commerce Statistics, and sector-specific data such as Transportation.
The BEA (Bureau of Economic Analysis) Industry Economic Accounts "show how industries provide input to, and use output from, each other to produce gross domestic product. These accounts provide detailed information on the flows of the goods and services that make up the production processes of industries." In addition to the Input-Output (I-O) Accounts, this site also includes reports on Gross Domestic Product by industry, travel and tourism, and transportation.
"The Food Marketing Institute (FMI) conducts programs in research, education, industry relations and public affairs on behalf of its 2,300 member companies - food retailers and wholesalers - in the United States and around the world." Although most of the content on its website requires membership, there is a some useful and freely available information listed under Industry Topics.
"The State Data Center (SDC)’s mission is to support access to all U.S. Census Bureau data and information for Massachusetts residents and organizations. The SDC is the official local source of demographic, economic and social statistics produced by the U.S. Census Bureau."