The U.S. Census Bureau has released the 2013 Nonemployer Statistics on .
Nonemployer Statistics is an annual series that provides subnational economic data for businesses that have no paid employees and are subject to federal income tax. The data consist of the number of businesses and total receipts by industry. Most non-employers are self-employed individuals operating unincorporated businesses (known as sole proprietorships), which may or may not be the owner's principal source of income.
Statistics are presented in hypertext format (HTML), and comma separated value files (.csv) for download and manipulation. The data are accessible through the U.S. Census Bureau’s American FactFinder and the Nonemployer Statistics website.