Detroit has shrunk to under 700k people. Memphis about to pass Detroit, Baltimore 800k+ and has been bigger then Detroit for over a decade now.
Edit: your right actually
"New York city had the largest number of people reporting as Black with about 2.3 million, followed by Chicago, 1.1 million, and Detroit, Philadelphia and Houston, which had between 500,000 and 1 million each"
Detroit is the biggest by percentage
Find out about the top 10 cities in the US that have the highest percentage of African Americans living there.
www.infoplease.com