The value of all farmsand rural real estate for sale in Vermont's Addison County recently was approximately $89 million, representing a total of 1,823 acres of land for sale in Addison County. Addison County ranks 12th in the Green Mountain State for the total acreage of land currently advertised for sale. Of all locations in Addison County with land for sale, Monkton featured the most land for sale. Addison County is one of the ten largest counties in Vermont (807 square miles). It's located in the North Vermont region of Vermont.