1. How many people have IDD?

People with IDD in the United States. Infographic of 100 silhouettes of people arranged in 5 rows of 20. These people represent 7.39 million people with intellectual and developmental disabilities in the US in 2019. A blue box is drawn around 22 people, representing 22% of people with IDD known to state IDD agencies. 19 of those 22 are highlighted in green, representing 19% of people with IDD who received long-term supports and services through state IDD agencies.

An estimated 6.99% of children and 0.78% of adults in the United States have intellectual or developmental disabilities. Based on those estimates, there were 7.3 million people with IDD in the United States in 2019.
These estimates change as prevalence estimates are updated.
Of the people with IDD in the US, an estimated 22% or 1.58 million people are known to state IDD agencies.
Nearly all people known to state IDD agencies get case management. An estimated 1.40 million (19%) receive additional long-term supports or services