People with IDD in the United States
There were 7.39 million people with an intellectual or developmental disability in the United States in 2019. Of those, 22% or 1.58 million people were known to their state developmental disabilities agency. 19% or 1.40 million people received at least one long-term support or service in addition to case management.
Note: US prevalence estimates for adults are from 1994/95 National Health Interview Survey (NHIS) Disability Supplement. Prevalence (Larson, et al., 2001). Estimates for children are from the 2016 NHIS (Zablotsky et al., 2017).
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