The phrase "upper middle" refers to a social or economic class that is above the middle class but not quite considered wealthy or upper class. Full definition
But resistance to such a discussion may be considerable in upper middle class congregations. (religion-online.org)
This results in teens from lower middle class areas being placed in upper middle - class homes. (cyc-net.org)
Energy costs eat up ~ 4 % of the income of an middle to upper middle income family while it can eat up 20 % of the income of a low income household. (dotearth.blogs.nytimes.com)