[iowamark]

I believe that, in the 1940’s(?), Mississippi was the only state where blacks were the majority of the population.

[BwanaNdege]

These states alone have had a majority Black population, for the periods indicated:

South Carolina 1820’s-1920’s
Mississippi 1840’s - 1930’s
Louisiana 1810 - 1890’s (except 1860’s - 49.5%)

http://en.wikipedia.org/wiki/List_of_U.S._states_by_African-American_population

U.S. Census Bureau (2011). “2010 Census Interactive Population Search”. Retrieved 2011-06-24.
“Historical Census Statistics on Population Totals By Race, 1790 to 1990, and By Hispanic Origin, 1970 to 1990, For The United States, Regions, Divisions, and States”. Census.gov. Retrieved September 15, 2012.

[BwanaNdege]

Here is a comparison of the demographics of cities.

"There are 19 American cities with populations over 100,000 that have majority (over 50%) Black or African-American populations."

City	Total Population	Black or African American, alone or mixed with other races	Black or African American, alone	Mixed-race Black/African-American
Rank	Percent of total population	Rank	Percent of
total population	Rank	Percent of
total population
Detroit, MI	713,777	1	84.3	1	82.7	83	1.6
Jackson, MS	173,514	2	80.1	2	79.4	242	0.7
Miami Gardens, FL	107,167	3	77.9	3	76.3	91	1.6
Birmingham, AL	212,237	4	74.0	4	73.4	257	0.6
Baltimore, MD	620,961	5	65.1	5	63.7	134	1.3
Memphis, TN	646,889	6	64.1	6	63.3	225	0.8
New Orleans, LA	343,831	7	61.2	7	60.2	184	1.0
Flint, MI	102,434	8	59.5	9	56.6	9	2.9
Montgomery, AL	205,764	9	57.4	8	56.6	231	0.8
Savannah, GA	136,286	10	56.7	10	55.4	139	1.3

[deport]

Current estimated Black population by state... 2013

http://blackdemographics.com/population/black-state-population/