Mitchellville is a majority African-American unincorporated area and census-designated place in Prince George's County, Maryland, United States. Per the 2020 census, the population was 11,136. Mitchellville was named for John Mitchell, who owned Essington Hall, the plantation that encompassed much of the area. He and his wife Mary Lanham are b…Mitchellville is a majority African-American unincorporated area and census-designated place in Prince George's County, Maryland, United States. Per the 2020 census, the population was 11,136. Mitchellville was named for John Mitchell, who owned Essington Hall, the plantation that encompassed much of the area. He and his wife Mary Lanham are buried in the Mitchell Family Cemetery on Mitchellville and Mount Oak Road. This location is now South Bowie, and the Bowie CDP 08775 An 1878 G.M. Hopkins Atlas shows "Mitchellville P.O." near the same corner of what is today Mitchellville and Mount Oak Road. In its original cataloging the name and place "Mitchellville", the USGS used the railroad guide "Mitchellville G. S. Owensville sheet Mitchellville P. G. 614 Mulliken R.'R. Guide, 314." as a basis in its decision card documentation where a Mullikin/Mitchellville railroad stop served also as the post office. This is also seen in other historic maps