There was a combined almost $80 million of land 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 approximately 4,000 acres. Johnson County ranks 28th in the Land of Opportunity for the total acreage of land currently advertised for sale. Among cities in Johnson County with farms, ranches, and rural real estate for sale, 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 the state.