Intellectual and developmental disability prevalence

The U.S. Census Bureau reported that there were 73.6 million children 17 years or younger and 249.5 million adults ages 18 years or older in the United States in 2016. Applying the prevalence rate of 69.9 per 1,000 for children from the 2016 NHIS and 7.9 per 1,000 for adults from the 1994/1995 NHIS-D we estimate there were 5,147,596 children, and 1,970,933 adults with IDD in the 2016 U.S. civilian noninstitutionalized population. An additional 255,873 people with IDD of all ages lived in congregate settings of four or more people, nursing homes, or psychiatric facilities on June 30, 2016. In total, we estimate that there were 7,374,402 people with IDD in the U.S. in 2016 (22.8 per 1,000).

For more information on IDD prevalence data, visit


Browse our resources in this topic area