The value of land and rural real estate for sale in Johnson County recently on Land.com was almost $76 million. This represents almost 5,000 acres of land and rural real estate for sale in Johnson County. Johnson County ranks 26th out of 75 counties in the Wonder State for the total number of acres of land currently advertised for sale. Of all ranches, farms, hunting land and other rural land and acreage for sale in Johnson County, Clarksville had 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 Arkansas.