It's a bit more intermingled. For example, Williamson County, TN (Nashville suburbs) is one of the 10 highest-income counties in the entire country. The Dallas,

It's a bit more intermingled. For example, Williamson County, TN (Nashville suburbs) is one of the 10 highest-income counties in the entire country. The Dallas, Atlanta, Chicago, and Denver suburbs are also very affluent. Wikipedia's collected some of the recent per-county census data here, although that isn't a perfect metric since states vary a lot in county size: https://en.wikipedia.org/wiki/List_of_highest-income_counties_in_the_United_States https://en.wikipedia.org/wiki/List_of_highest-income_countie... In general there's a good/bad outcomes split within (almost?) every major American city between the affluent and the poor neighborhoods. I haven't verified this with the life-expectancy data, but I would bet it differs more between rich vs. poor areas within each state, than it does between coastal and non-coastal states.