The value of all farmsand rural real estate for sale in Windham County, Vermont, recently was nearly $166 million, representing a combined 2,833 acres of land for sale in Windham County. Windham County ranks first in the Green Mountain State based on the total amount of acres of land for sale among all the counties in the Green Mountain State. Wilmington featured the most land for sale. Based on its natural assets, tourism and recreation are important contributors to the Windham County economy. Windham County is one of the ten biggest counties in Vermont (798 square miles). It's located in the South Vermont region of Vermont.