A total of approximately 2,000 acres were listed for sale in Vermont's Addison County recently, representing a total value of nearly $90 million in Addison County farms and rural land for sale. Addison County ranks 12th in the Green Mountain State for the total acreage of land currently advertised for sale. Middlebury had the most land for sale. Addison County is one of the ten biggest counties in Vermont (807 square miles). It's located in the North Vermont region of Vermont.