The U.S. Government agency responsible for collecting and publishing the bulk of industry statistics is the U.S. Census Bureau, a division of the Commerce Department. Reports based on these statistics are organized by NAICS, the North American Industry Classification System. [http://www.census.gov/ eos/www/naics/] You can also use the Free NAICS Look Up from the NAICS Association.
Note: An older classification system still in use is the SIC - Standard Industrial Classification. [http://www.osha.gov/cgi-bin/sic/sicser5]
Every five years (years ending in 2 and 7), a comprehensive Economic Census is conducted to gather details about economic activity by sector and by state, and, in most cases, for counties and cities as well.
You can also explore the Business Help Site from the US Census Bureau for access to many different data sets. You will need to know the NAICS (North American Industry Classification System) code for your industry.
DataUSA [https://datausa.io] is a visualization site for government data jointly presented by the Massachusetts Institute of Technology's Media Labs and consulting firm Deloitte.