Land for sale in Illinois's Perry County recently totaled $4 million and nearly 1,000 acres. Perry County ranks 91st out of 102 counties in the Prairie State for the total number of acres of land currently advertised for sale. Du Quoin had the most land for sale. From an economic perspective, government and state-level services contribute most to Perry County's overall GDP. Perry County is the 63rd biggest county (446 square miles) in Illinois. It's located in the Southern Illinois region of the state.