William B. Sappington House, also known as Prairie Park, is a historic home located near Arrow Rock, Saline County, Missouri. It was built in 1843, and is a -story, square, Greek Revival style brick dwelling on a limestone foundation. It measures 60 feet wide. The front facade features a two-story front portico with Doric order and Ionic order columns. Its roof is topped by a roof deck and cupola. The house was extensively restored from 1948 to 1955.
It was added to the National Register of Historic Places in 1970.