A biography of William Foust is included in "Progressive Men of the State of Montana". Parents: Jonas and Adeline (Ashworth) Foust, natives of PA and NC. Both parents died when William was young. On Feb 1882, William married Miss Effie C. Carter, of Iowa, daughter of Samuel Carter, a native of Virginia. Foust children: Hugh, Esther, Frederick, Arthur, Amanda, William, Roxie, and an infant.