Employment Statistics For Human Resources Positions – US Bureau of Labor Statistics

From The Occupational Outlook Handbook, 2010-11 Edition - Human Resources, Training, and Labor Relations Managers and Specialists

Human resources, training, and labor relations managers and specialists held about 904,900 jobs in 2008. The following tabulation shows the distribution of jobs by occupational specialty:

Training and development specialists	216,600
Employment, recruitment, and placement specialists	207,900
Compensation, benefits, and job analysis specialists	121,900
Compensation and benefits managers	40,500
Training and development managers	30,400
Human resources, training, and labor relations specialists, all other	224,600
Human resources managers, all other	63,100

Human resources, training, and labor relations managers and specialists were employed in virtually every industry. About 13 percent of human resources, training, and labor relations managers and specialists were employed in administrative and support services, 11 percent in professional, scientific, and technical services, 10 percent in healthcare and social assistance, and 9 percent in finance and insurance firms. About 12,900 managers and specialists were self-employed, working as consultants to public and private employers. 

Reference: http://www.bls.gov/oco/ocos021.htm