Where are autism rates the highest?

Ubiquitous: Autism spectrum disorder (ASD) prevalence rates are actually fairly equivalent across the United States. The diagnosis of ASD continues to rise, possibly due to more clear guidelines for the diagnosis being established. Research is on-going to help us understand ASD better, and of course researchers are still looking for an underlying cause (or causes) for asd.

Varies: The incidence of autism in european countries and the us are similar. The incidence in japan and arabian countries appears to be higher. This based on data from cuny-autism developmental disabilities outside euorppe and north america.