Survey of Business Owners: How can I get data by company size?
Three programs in American FactFinder show size data:
The annual Statistics of U.S. Businesses shows employment size of firms. For economic census years, it also shows revenue size of firms. You can access these data from the Business & Industry page. These data are not available in American FactFinder.
For a discussion of the various ways of defining small business and large business, and links to all relevant data sources, see Small Business on the Business & Industry webpage.