[ohashi]

It's about 50% (50.7) http://quickfacts.census.gov/qfd/states/11000.html

[waterlesscloud]

It's been as high as 71.1% Black (in 1970). The percentage has been decreasing as Blacks have moved to the suburbs and Hispanics have moved into the city.

[pilom]

Well, I would argue a large number of young white professionals have moved in to and are gentrifying many parts of DC.

[ohashi]

I agree that this is the bigger trend changing the demography of DC. Neighborhoods like Columbia Heights, Petworth, etc.