Any decent-sized US city has its share both wealth and poverty, but most are dominated by postwar development, so the two are separated by miles of freeway rather than feet of sidewalk.

Where inequality seems worse, you are probably seeing a successful progressive effort to prevent segregation, and vice versa. When your neighbors and everyone you encounter in daily life are all in roughly the same economic shape as you, that doesn't mean you're living in an egalitarian society. Quite the opposite.