This study aimed to estimate the prevalence and characteristics of adults with Autism Spectrum Disorders (ASDs) living in the community in England. Using a stratified, multiphase random sample from the third national survey of psychiatric morbidity in adults in England in 2007, the researchers found a weighted prevalence of ASD in adults to be 9.8 per 1000 (95% CI, 3.0-16.5). The prevalence was not related to age, but was higher in men, those without educational qualifications, and those living in rented social housing. There was no evidence of increased use of mental health services among adults with ASD. The findings suggest that the prevalence of ASD in this population is similar to that found in children and that the causes of ASD are temporally constant, with no significant increase over time. Adults with ASD are socially disadvantaged and often unrecognized, highlighting the need for better recognition and support.This study aimed to estimate the prevalence and characteristics of adults with Autism Spectrum Disorders (ASDs) living in the community in England. Using a stratified, multiphase random sample from the third national survey of psychiatric morbidity in adults in England in 2007, the researchers found a weighted prevalence of ASD in adults to be 9.8 per 1000 (95% CI, 3.0-16.5). The prevalence was not related to age, but was higher in men, those without educational qualifications, and those living in rented social housing. There was no evidence of increased use of mental health services among adults with ASD. The findings suggest that the prevalence of ASD in this population is similar to that found in children and that the causes of ASD are temporally constant, with no significant increase over time. Adults with ASD are socially disadvantaged and often unrecognized, highlighting the need for better recognition and support.