Formed in 1984, the National Association of Professional Employer Organizations is the national trade association for the PEO industry. NAPEO is known both as NAPEO — The Voice of the PEO Industry® for government affairs and as The Source for PEO Education® due to the association's education and training programs. NAPEO promotes a Code of Ethics and a number of best practices to its member companies. NAPEO has nearly 400 PEO members operating in all 50 states, representing approximately 90 percent of the revenues of the $61 billion industry.