Keyword: most.
In San Francisco, 100k qualifies you for governmental support services like low income housing.
In San Francisco, 100k qualifies you for governmental support services like low income housing.
Because with a population of 800k, San Francisco makes up 0.25% of the 332 million people in the US.
I am sure there are additional areas where people making 100k are not middle class.
I am also sure that there are many more areas where this is not the case.