William D. Kincaid, son of James and Catherine (Reich) Kincaid, was born in Philadelphia, May 23, 1848. He was educated in the Quaker College at Philadelphia and followed clerking and bookkeeping in Philadelphia, Allentown, and in the West. During the Civil War, when not quite 16 years of age, he enlisted in Co. C, 198th Regiment, Penna. Volunteers, and served for one year in the First Brigade, First Division, Fifth Army Corps, Army of the Potomac. He was wounded in the battle of Five Forks. In 1874 he came to Allentown, where he has since resided, and is employed as a bookkeeper and solicitor.

He married Alice Keck, daughter of Moses and Deliah (Dubbs) Keck, and they had two children: Jennie M., who married Joseph Howard; and Dr. Raymond K.