"The Economic Census provides a detailed portrait of the Nation's economy once every five years, from the national to the local level. The 1997 Economic Census covers nearly all of the U.S. economy in its basic collection of establishment statistics. There also are several related programs, including statistics on minority and women-owned businesses. Censuses of agriculture and governments are conducted at the same time. The first reports from the 2002 Economic Census are now available as well." This site can be searched by NAICS codes. The 2002 US NAICS Manual North American Industry Classification System--United States, 2002 includes definitions for each industry and is available in print at the Brooklyn College Library Government Information service desk, as well as at the link provided above.
Resource URL: http://www.census.gov/econ/