Dtail
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There are cheaper states. Although the population density is low most folks live in the cities or ave a good reason to be in the smaller places. Here is one version of col by state https://www.usnews.com/news/best-states/rankings/opportunity/affordability
I would say that this list is probably more relevant when working, but the housing portion of the index might not matter as much for a retiree who builds up house equity in a costlier housing state.