 adelphi is an unincorporated area and census-designated place in prince george's county, maryland. the population was 15,086 at the 2010 united states census. it includes the communities of adelphi hills, buck lodge, chatham, cool spring terrace, and white oak manor. ==history== the unincorporated adelphi community takes its name from the historic adelphi mill, established in 1796 along the northwest branch of the anacostia river. the adelphi mill is administered by the maryland-national capital park and planning commission and continues to attract visito
Census-designated_places_in_Maryland Census-designated_places_in_Prince_George\'s_County,_Maryland Populated_places_established_in_1796 Washington_metropolitan_area