The United States government is an excellent source of information on industries. Much of it is free to use though there are often limits in terms of search functionality and output.
The U.S. Census Bureau is one of the biggest government sources of business information but there are others. Below are some of the major resources produced by that agency that can be used for industry research. However, there are many other agencies which produce industry-related information specific to certain industries. Below are a few examples that we have provided more details to:
Beyond those above, there are other agencies also produce data to mention.