Detroit, a city that suffered major manufacturing job losses in the '70s and '80s, has a large income disparity between downtown and outlying suburbs.
Similarly in LA, economic opportunity is spread unevenly across the city's geography.
Wealthy households are centered in coastal areas, like Hollywood and Santa Monica, and the hills overlooking the city. Low-income parts of LA are downtown and to its south, in the San Fernando Valley, and in the San Bernardino area east of the city.
Manhattan neighborhoods are mostly rich except for parts of the Lower East Side and the northern part of the island.
Gentrification, particularly in Brooklyn, has raised income levels in some NYC neighborhoods in recent years.