The Duvall–Ash Farmstead is a historic farm located northeast of Fiatt in Fulton County, Illinois. Edward Duvall built the farm's oldest buildings, the house and smokehouse, circa 1848. Duvall gave the farmhouse a Gothic Revival design with multiple front-facing gables decorated with bargeboards and topped by finials. In the 1890s, Singleton K. Ash purchased and extensively renovated the farm. Ash placed a Victorian addition on the rear of the house which featured decorative stickwork and bracketing. In addition, Ash and his family built most of the farm's current outbuildings, which include a chicken coop, barns, and storage sheds; these outbuildings form a complete collection of typical outbuildings from an 1890s farm.