There was a total of around $76 million of ranches, farms, hunting land and other rural land and acreage for sale in Johnson County recently on Land.com. The total size of all Johnson County farms, ranches, hunting land and other land for sale was around 5,000 acres. Johnson County ranks 27th in the state for the total number of acres of land currently advertised for sale. Clarksville featured the most land for sale. From an economic perspective, manufacturing and related services are the main sectors in Johnson County. Johnson County is Arkansas's 33rd largest county (682 square miles). It's located in the River Valley Arkansas region of the state.