How many people have IDD?

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Image of 100 human silhouettes representing prevalence of IDD in 2020. They are different colors and some are outlined in red. Dark blue figures represent 2.88 million children with developmental delays but not intellectual disabilities or autism spectrum disorder. Light blue figures represent 3.22 million children with intellectual disabilities or autism spectrum disorder. Gold figures represent 2.28 million adults with intellectual and/or developmental disabilities. Twenty percent of the children and 44% of the adults are circled in red representing the proportions of each who were known to state IDD agencies.

Details

  • Among children birth to 21 years, 12% (644,948 children) got services through state IDD agencies in 2020.
  • Of the 5.5 million children who did not receive LTSS through state IDD agencies, most got services from schools. Some got services from other state agencies.
  • Among adults 22 years or older, 44% (1 million adults) got services through state IDD agencies in 2020.
  • Nearly 1.3 million adults did not get services through state IDD agencies.
  • Most adults are supported informally by families.
  • An unknown number of adults with IDD got other government benefits such as supplemental security income, public housing, or food assistance.

Full list of Key Questions about Support for People with IDD