2. Brault, M. W. (2012). Americans With Disabilities. Retrieved from U.S. Census Bureau Website: http://www.census.gov/prod/2012pubs/p70-131.pdf
According to the U.S. Census Bureau's 2010 Current Population Report, there were approximately 1.2 million non-institutionalized adults [0.5%] who had an Intellectual Disability (formerly known as Mental Retardation).
Of those, 944,000 [0.4%] were reported to have other developmental disabilities such as cerebral palsy or autism.