US places with the Sharpest demographical/economical divides

[thebeloitmoderate]

We all know for St Louis if you go north of Delmar the neighborhood is nearly all African American same thing for Kansas City east of Troost and famously but gentrifying DC east of the Anacostia river. 

[Roll Roons]

Most major cities have very wealthy parts that are mostly white with some Asians, and very poor areas that are mostly black or Hispanic.

Compare the Upper East Side to the South Bronx, or Gold Coast to Englewood in Chicago.

[ProgressiveModerate]

Detroit metro between Wayne County and Macomb and Oakland counties though it is becoming less extreme.

Brooklyn too.

[It’s so Joever]

East Cleveland.

[President Punxsutawney Phil]

The DFW Metroplex is up there.
Cross the Dallas County line and you go from Lancaster (among the most heavily AA cities in the region, 69% black), to very heavily white Dallas exurbia in Ellis County. Southern Dallas County is a bit like DeKalb County, GA, except DeKalb's borders are no longer the end to Dem-leaning areas they used to be.

[thebeloitmoderate]

In PG county MD depending on the 295 Beltway if you are inside the beltway it is a continuation of Southeast/Northeast DC east of the river if you are outside the beltway it is a mostly affluent majority black area with a mix of wealthy neighborhoods and rural forested areas.

[Libertas Vel Mors]

The DFW Metroplex is up there.
Cross the Dallas County line and you go from Lancaster (among the most heavily AA cities in the region, 69% black), to very heavily white Dallas exurbia in Ellis County. Southern Dallas County is a bit like DeKalb County, GA, except DeKalb's borders are no longer the end to Dem-leaning areas they used to be.

Speaking of which, why is the Ellis-Dallas county line such a big divide? There isn't a highway or any similar factor that I can think of.

[President Punxsutawney Phil]

The DFW Metroplex is up there.
Cross the Dallas County line and you go from Lancaster (among the most heavily AA cities in the region, 69% black), to very heavily white Dallas exurbia in Ellis County. Southern Dallas County is a bit like DeKalb County, GA, except DeKalb's borders are no longer the end to Dem-leaning areas they used to be.

Speaking of which, why is the Ellis-Dallas county line such a big divide?

I think the likeliest reason is that black Americans migrating to the DFW metroplex tend to head north instead of south, while whites leaving suburban areas in the region for exurban ones in many cases might go south instead of north. (Metro Atlanta is opposite in all these respects)

[cvparty]

Santa Ana and Irvine are about as opposite as you can get

[ProgressiveModerate]

Also pretty much any Native American reservation lol

[VPH]

Philadelphia itself has an insane divide. Even when it comes to life expectancy, there's a 20-year gap between people in Society Hill (88 years) and parts of North Philly (68 years).

[chalmetteowl]

We all know for St Louis if you go north of Delmar the neighborhood is nearly all African American same thing for Kansas City east of Troost and famously but gentrifying DC east of the Anacostia river. 

Arabi, LA and the Lower 9th Ward of New Orleans... Arabi is gentrifying while the Lower 9th remains one of the most dangerous neighborhoods in the city

and Chalmette, LA and New Orleans East is another stark contrast