what county is adelphi md in
Adelphi is an unincorporated area and census-designated place in Prince George's County, Maryland, United States. The population was 14,998 at the 2000 census. It includes the communities of Adelphi Hills, Buck Lodge, Chatham, Cool Spring Terrace, and White Oak Manor. The unincorporated Adelphi community takes its name from the historic Adelphi Mill, established in 1796 along the Northwest Branch of the Anacostia River.