Kentucky's 264-square-mile Johnson County covers less than one percent of the state's total land area. Of the 120 counties in Kentucky, Johnson County ranks 50th in terms of the size of its population (23,175, according to 2015 Census estimates). Recent Lands of America data shows that the average price-per-acre value of land for sale in Johnson County is $30,000. The average list price of property and land for sale was $30,000 and the median size of land and real estate for sale in Johnson County was one acre. Land for sale in Johnson County totaled one acres and $30,000 in overall land value. Farmland was the most common type of land for sale in Johnson County.