More than 53 percent of jobs for PAs were in the offices of physicians. About 24 percent were in general medical and surgical hospitals, public or private. The rest were mostly in outpatient care centers, including health maintenance organizations; the Federal Government; and public or private colleges, universities, and professional schools. Very few were self-employed.
Source: U.S. Department of Labor, Occupational Outlook Handbook, 2010-11 Edition