About 3.2% of children in the United States have autism, according to the most recent CDC data from 2022. That translates to roughly 1 in 31 eight-year-olds, making autism one of the most common developmental conditions in childhood. The rate varies significantly by location, sex, and race, and it has climbed steadily over the past two decades.
The Current Numbers
The CDC tracks autism prevalence through its Autism and Developmental Disabilities Monitoring (ADDM) Network, which collects data from 16 sites across the country. In 2022, the network found an overall prevalence of 32.2 per 1,000 children aged 8, or about 1 in 31. That’s up from roughly 1 in 150 when the CDC began reporting comparable estimates in the early 2000s.
Globally, the picture looks different. The World Health Organization estimates about 1 in 100 children worldwide are diagnosed with autism, reflecting lower screening rates and different diagnostic practices in many countries.
Boys vs. Girls: A Shifting Gap
Autism has long been considered far more common in boys. In the U.S., about 4 in 100 boys and 1 in 100 girls currently have a diagnosis. Among younger children (under 10), boys are still diagnosed about three times as often as girls.
But that gap is narrowing fast, especially in older age groups. A large Swedish study tracking nearly 2.8 million people born between 1985 and 2020 found that by age 20, the male-to-female ratio for new diagnoses dropped from about 1.9 in 2016 to 1.2 in 2022. For teens and young adults diagnosed between 2020 and 2022, there was essentially no difference between males and females. Researchers projected the ratio would reach full parity at age 20 by 2024. This shift likely reflects growing recognition that autism presents differently in girls, who are more likely to mask social difficulties and get diagnosed later.
Differences by Race and Ethnicity
Autism prevalence in the U.S. is no longer highest among white children, a reversal from earlier years when white families had better access to diagnostic services. Current estimates show:
- American Indian or Alaska Native: 3.8%
- Asian or Pacific Islander: 3.8%
- Black: 3.7%
- Hispanic: 3.3%
- White: 2.7%
This pattern likely reflects improvements in screening and outreach to communities that were historically underdiagnosed rather than a true difference in how often autism occurs across racial groups. As diagnostic access has expanded, the gaps that once made autism look like a condition affecting mostly white children have largely closed.
Wide Variation by Location
Where a child lives can dramatically affect the reported rate. Across the CDC’s 16 monitoring sites, prevalence in 2022 ranged from 1 in 103 children in Laredo, Texas to 1 in 19 in California. That fivefold difference doesn’t mean autism is five times more common in California. It reflects differences in screening infrastructure, access to specialists, insurance coverage, and how aggressively states pursue early evaluation. Areas with more resources and awareness tend to identify more children.
Why the Numbers Keep Rising
The jump from 1 in 150 two decades ago to 1 in 31 today looks alarming at first glance, but researchers at Johns Hopkins point to several factors that explain most of the increase without requiring an actual rise in how many children are autistic.
The biggest driver is a broader definition. Conditions that once had their own separate diagnoses, like Asperger’s syndrome and pervasive developmental disorder, now fall under the single umbrella of autism spectrum disorder. That change alone pulled a large group of people into the autism count who wouldn’t have been included before. Better screening at routine pediatric visits has also caught children who would have been missed in earlier eras, and reduced stigma has made parents more willing to seek evaluation.
One telling detail: researchers have looked specifically at children with the most significant support needs, those who require around-the-clock care, have very limited verbal communication, or have co-occurring intellectual disability. Rates for that subgroup have increased minimally, if at all, over the past decade. Nearly all of the growth has come from children with more subtle presentations and fewer co-occurring conditions. In other words, the increase is concentrated among kids who would have gone unidentified under older, narrower criteria.
Adults vs. Children
The CDC estimates that about 2.2% of U.S. adults have autism, based on 2017 data. That’s lower than the childhood rate, and the gap is mostly a reflection of the era those adults grew up in. Many were never evaluated as children because screening was less common and the diagnostic criteria were narrower. Adult diagnosis rates are climbing as more people recognize traits in themselves and seek assessment later in life, a trend that mirrors the closing gender gap among teens and young adults.