Born 9 Jun 1818, Lewistown, Mifflin County, the son of the Hon. William Plunket and Jane Holmes Maclay. Settled originally in Sligo, Clarion County, farmer, served a single three-year term in the state Senate, 1872-1875, representing Clarion County. He married Elizabeth Plunket Richardson, 1846, in Wayne Co., New York. David Maclay died November 6, 1894, Missoula, Montana, where he is buried.