Industries with high levels of not-for-profit employment, 2006 Industry Thousands Vocational rehabilitation services 257.10 Offices of physicians 293.56 Business, professional, labor, political, and similar organizations 307.02 Residential mental retardation, mental health, and substance abuse facilities 337.26 Civic and social organizations 374.91 Nursing care facilities 411.47 Elementary and secondary schools 490.47 Individual and family services 665.18 Colleges, universities, and professional schools 994.51 General, medical, and surgical hospitals 3,375.84