About 1 in 31 children in the United States has autism spectrum disorder, according to the CDC’s most recent data, published in July 2025. That figure comes from surveillance of 8-year-olds in 2022 across 16 monitoring sites, and it represents a significant jump from just a few years earlier, when the estimate was 1 in 36. With roughly 73 million children in the U.S., the numbers translate to well over two million kids living with an autism diagnosis.
How the Numbers Have Changed Since 2000
The rise in autism prevalence over the past two decades is striking. In 2000, the CDC’s monitoring network estimated that 1 in 150 eight-year-olds had autism. By 2008, it was 1 in 88. By 2016, 1 in 54. The latest figure of 1 in 31 means identified prevalence has roughly quintupled in just over 20 years.
That doesn’t necessarily mean autism itself has become five times more common. A large share of the increase reflects broader diagnostic criteria, greater awareness among parents and pediatricians, and better screening in communities that were previously underserved. The diagnostic definition expanded in 2013 when the DSM-5 folded several previously separate diagnoses (like Asperger’s syndrome) into a single autism spectrum. Still, researchers acknowledge that a real increase in prevalence, beyond improved detection, hasn’t been ruled out.
The pace of the increase is actually accelerating. Between the 2020 and 2022 surveillance years, prevalence rose 22% across the sites that reported both times. Nine of 11 returning sites saw increases ranging from 14% to nearly 37%.
Boys, Girls, and a Narrowing Gap
Autism has long been described as far more common in boys. For young children, that remains true: among kids under 10, boys are diagnosed about three times as often as girls. But newer research shows the gap shrinks dramatically with age. A large birth-cohort study published in The BMJ found that by age 20, the male-to-female ratio for cumulative autism diagnoses dropped to about 1.2 to 1 in 2022. Projections from that study suggested the ratio could reach parity by 2024.
For birth cohorts from 2000 onward, girls and women over age 15 were actually being diagnosed at equal or slightly higher rates than males in the same age group. This shift likely reflects growing recognition that autism often presents differently in girls, who may be more likely to mask social difficulties or develop coping strategies that delay identification. The result is a wave of later diagnoses in adolescent girls and young women that is reshaping the longstanding assumption that autism is overwhelmingly a male condition.
Wide Variation Across Communities
The national 1-in-31 figure is an average, and the reality varies enormously depending on where a child lives. Across the CDC’s 16 monitoring sites, prevalence ranged from 1 in 103 in the Laredo, Texas, area to 1 in 19 in California. That fivefold difference between the lowest and highest sites has less to do with biology and more to do with access to diagnostic services, availability of specialists, state-level screening policies, and how thoroughly local health and education records capture autism evaluations.
Communities with well-resourced developmental pediatrics programs and strong school-based screening tend to identify more children. Areas with fewer specialists, larger uninsured populations, or language barriers tend to report lower rates, not because fewer children have autism, but because fewer receive a formal diagnosis.
How Autism Is Identified
Clinicians diagnose autism based on two core features. The first is persistent difficulty with social communication and interaction, such as trouble with back-and-forth conversation, reading nonverbal cues, or building peer relationships. The second is restricted or repetitive behaviors, interests, or movements, like intense fixation on specific topics, distress with changes in routine, or sensory sensitivities.
These signs need to be present from early childhood and cause noticeable challenges in everyday life. Autism is also categorized into three severity levels: Level 1 (needs some support), Level 2 (needs substantial support), and Level 3 (needs very substantial support). A child at Level 1 might struggle socially but manage in a mainstream classroom with accommodations, while a child at Level 3 may have very limited speech and need full-time assistance.
The Financial Reality for Families
Raising a child with autism often comes with significant costs that insurance doesn’t fully cover. CDC data from employer-sponsored health plans showed that average annual medical spending for children ages 3 to 7 with autism reached nearly $20,000 by 2017, a 51% increase from 2011. The biggest driver was behavioral therapy: spending on outpatient behavioral interventions per child jumped 376% over that same period, from about $1,750 to over $8,300 per year.
Intensive early intervention programs, which evidence suggests work best at 25 to 40 hours per week, can exceed $50,000 annually per child. By 2017, about 6% of young children with autism on employer plans were incurring that level of spending. Despite the strong evidence for early, intensive therapy, only a minority of eligible children actually receive it, often because of cost, waitlists, or geographic barriers to qualified providers.
What’s Driving the Rising Numbers
Several forces are pushing prevalence figures upward at the same time. Screening has expanded: the American Academy of Pediatrics recommends universal autism screening at 18 and 24 months, and more pediatricians are following through. Racial and ethnic disparities in diagnosis have narrowed, meaning Black, Hispanic, and Asian American children who would have been missed a decade ago are now being identified. Schools have also become better at flagging developmental concerns and connecting families with evaluations.
The broadened diagnostic criteria play a role too. Children who might previously have been labeled with a language delay, social anxiety, or an intellectual disability now receive an autism diagnosis when they meet the spectrum’s criteria. And growing cultural awareness means parents are more likely to seek evaluation when they notice early signs, rather than waiting for a teacher or doctor to raise concerns.
Whether the numbers will continue climbing is uncertain, but the trajectory since 2000 has moved in only one direction. Each new CDC report has found a higher rate than the last, and nothing in the current data suggests that pattern is about to reverse.