WEST Alaska, Arizona, California, Colorado, Hawaii, Idaho, Montana, Nevada, New Mexico, Oregon, Utah, Washington, Wyoming.
MIDWEST Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, Wisconsin.
NORTHEAST Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island, Vermont.
SOUTH Alabama, Arkansas, Delaware, District of Columbia, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Oklahoma, South Carolina, Tennessee, Texas, Virginia, West Virginia.
STATE ROUNDUPS Our coverage of trends in state legislatures and regulatory bodies is also a good source of information about developments in different parts of the country.
Additional short regional news can be found in the news briefs archives in each section.
States are grouped into geographic regions as defined by the U.S. Census Bureau.
 Arizona and Missouri have the highest prevalence of autism cases; Florida has the lowest.
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