Hickory County is located in the U.S. state of Missouri. As of the 2020 census, the population was 8,279. Its county seat is Hermitage. The county was organized February 14, 1845, and named after President Andrew Jackson, whose nickname was "Old Hickory." The Pomme de Terre Dam, a Corps of Engineers facility, is located three miles south of Hermitage and forms Lake Pomme de Terre by damming the Pomme de Terre River and Lindley Creek.