Johnston County is in Lake & Trail Country Oklahoma. Of the 77 counties in the Sooner State, Johnston County is 58th in terms of its size (658 square miles). A recent survey of Land Network data includes almost 2,000 acres of farms for sale in Oklahoma's Johnston County, which is valued at a combined $12 million. The average price of farms for sale in Johnston County was $780,272. Farms for sale in Johnston County feature livestock including cattle, horses, goats, sheep and pig. Browse all Oklahoma farms for sale on the Land Network to find the farm, cattle operation, hobby farm or other farm property that's right for your future business or lifestyle needs.