This report compares national estimates of the supply and characteristics of 9 types of allied health workers drawn from 4 publicly available national data sources: the American Community Survey (ACS), the Current Population Survey (CPS), the Occupational Employment Statistics (OES), and the National Provider Identifier (NPI) Registry. The 9 occupations (or occupation groups) examined are occupational therapists, physical therapists, respiratory therapists, speech-language pathologists, clinical laboratory technologists/technicians, dental hygienists, diagnostic related technologists/technicians, medical assistants, and social workers.