A choropleth map of the U.S. showing the estimated share of adults over 65 who have Alzheimer's, as of 2020. The Alaska has the lowest rate (8.8%), followed by Mountain West states like Idaho and Montana (both 9.8%). The highest rates are on the coasts and the South, with D.C. leading at 16.8%, followed by Maryland (12.9%) and New York (12.7%).