A total of nearly 4,000 acres were listed for sale in Johnson County recently, representing a combined $73 million in Johnson County ranches, farms, hunting land and other rural land and acreage for sale. Johnson County ranks 29th out of 75 counties in the Natural State for the total number of acres of land currently advertised for sale. Clarksville featured the most land for sale. Manufacturing and related services are the largest economic sectors in Johnson County. Johnson County is the 33rd biggest county (682 square miles) in Arkansas. It's located in the River Valley Arkansas region of the state.