Metro-Denver, Metro-Austin/Dallas/Huston, Metro-Atlanta, Metro-Nashville, Metro-Chicago, Metro-Detroit, Metro-Minneapolis, etc. etc. etc.
I’d say it’s more city/suburban vs rural. This doesn’t account for the poor & homeless in all of America’s inner cities, but does a better job explaining.
Maybe “Fortune 500 headquarters adjacent” is the better indicator. The towns with big global companies almost always have affluent suburbs surrounding them. Even Cincinnati has tons of affluent people due to P&G.
Chicago, for example. My old stomping grounds. The inequality within that city is stark. Glaring. The South and West sides are a world apart from the North side.
In SF or LA they'd be middle-class.
It's not just about wealth in dollars, it's about purchasing power.
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_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.
If you generally are in the Bay Area or LA you rarely see the level of obesity you see in say Houston despite the fact that both areas despite being rich have their fair share of the poor too.
Similarly for smoking. It's exceedingly rare to see public smoking in the Bay Area.
Similarly for diets. When traveling in the South I was amazed at just how ridiculously unhealthy the average food eaten by the average person there was. Everything deep fried, laden with calories, consumed along with sugary drinks.
County level:
https://www.worldlifeexpectancy.com/usa/life-expectancy-by-c...
State and county level:
https://www.cdc.gov/nchs/data-visualization/life-expectancy/...
Food deserts and gang violence - both accelerated by concentrated poverty - are a couple of ways this manifests in some of the "elite" cities.