About 1 in 31 children in the United States has autism, based on the most recent data from the CDC’s surveillance network. That translates to a prevalence of roughly 3.2% among 8-year-olds, the age group the CDC uses as its benchmark. No single figure captures the entire U.S. population across all ages, but this childhood estimate is the most widely cited and most rigorously tracked number available.
The Latest CDC Numbers
The CDC’s Autism and Developmental Disabilities Monitoring (ADDM) Network reported in 2025 that among 8-year-olds surveyed in 2022, autism prevalence was 32.2 per 1,000 children across 16 monitoring sites. That 1-in-31 figure represents children born in 2014 and is the highest prevalence the network has ever recorded.
The ADDM Network doesn’t survey the entire country. It collects data from selected communities within participating states, so the numbers reflect a snapshot rather than a complete census. Still, the network has used the same methodology since 2000, making it the best tool for tracking how prevalence has changed over time.
How Prevalence Has Changed Since 2000
The rise over two decades is striking. The first ADDM survey, covering children born in the early 1990s, found a prevalence of about 1 in 150. The current figure of 1 in 31 is 4.8 times higher than that initial estimate. That trajectory looks like a steep climb: from roughly 0.67% of children in 2000 to 3.2% in 2022.
Whether this reflects a true increase in autism itself or better detection is one of the most debated questions in developmental science. Several factors almost certainly contribute to the statistical rise. Diagnostic criteria have broadened over time. The shift from the older DSM-IV manual to the current DSM-5 was actually expected to narrow the definition somewhat, and early analyses suggested about 81% of children who qualified under the old criteria also met the new ones. But awareness among parents, teachers, and pediatricians has expanded dramatically, and screening now reaches communities that were historically underserved. Children who might have received a different diagnosis or no diagnosis at all in 2000 are now being identified as autistic.
Wide Variation by Location
Prevalence varies enormously depending on where data is collected. Among the ADDM sites reporting 2022 data, California had the highest prevalence at 53.1 per 1,000 children (about 1 in 19), while Texas had the lowest at 14.3 per 1,000 (about 1 in 70). Pennsylvania came in at 47.4, Wisconsin at 38.4, and New Jersey at 34.0.
These gaps don’t mean autism is more common in California than Texas. The CDC notes that no research has shown living in a particular area increases the chance a child will have autism. Instead, variation likely reflects differences in how children are identified, what services are available, and how records are kept. States with more robust screening infrastructure and better access to developmental specialists tend to report higher numbers, which is really a sign of more complete detection rather than more autism.
The Gender Gap Is Shrinking
Autism has long been considered far more common in boys than girls, with ratios typically cited around 3 or 4 to 1. That picture is changing quickly. Among young children under 10, the ratio of boys to girls diagnosed with autism has stayed relatively stable at around 3 to 1 across recent years. But in older age groups, the gap has been closing fast.
A large birth cohort study published in The BMJ found that by 2022, the overall ratio of males to females diagnosed by age 20 had dropped to about 1.2 to 1. For individuals older than 15 diagnosed between 2020 and 2022, the ratio was no longer greater than 1 at all, meaning girls and women in that age range were being diagnosed at essentially the same rate as boys and men. Projections from the study suggested male-to-female parity at age 20 could be reached by 2024.
This shift is driven largely by a surge in diagnoses among adolescent and young adult women. Researchers point to several possible explanations: girls may present differently and get missed in early childhood, diagnostic criteria may have historically been calibrated to male presentations, and growing awareness of how autism looks in women is prompting more evaluations later in life.
Support Needs Across the Spectrum
Autism encompasses a wide range of abilities and challenges. The CDC reported for the first time in recent years that about 26.7% of 8-year-olds with autism meet the criteria for what researchers call “profound autism,” defined as being nonverbal, minimally verbal, or having an IQ below 50. That means roughly 1 in 4 autistic children have very high support needs that significantly affect daily functioning throughout life.
The remaining roughly 73% fall across a broad spectrum. Some need moderate support with social communication or managing transitions and routines. Others live independently with minimal or no formal support, and their autism may primarily affect social interactions or sensory processing. This distribution matters because public discussions about autism sometimes focus on one end of the spectrum or the other, when in reality the population is diverse in ways that affect what services, accommodations, and planning families need.
What About Adults?
The 1-in-31 figure applies to children. There is no equivalent large-scale surveillance system tracking autism prevalence in U.S. adults, which makes the total percentage of the population living with autism difficult to pin down. Many adults on the spectrum were diagnosed as children under earlier, narrower criteria. Many others, particularly women and people of color, were never diagnosed at all and may be seeking evaluations now for the first time.
If you apply the childhood rate to the broader population, you’d estimate that somewhere between 2% and 3% of Americans may be autistic, though the real number could be higher given how many adults remain undiagnosed. What’s clear is that the population of identified autistic people in the U.S. is substantially larger than it was even a decade ago, driven by a combination of broader criteria, better screening, and increased awareness across demographic groups.