Addison County is located in the Northwestern part of Vermont. It is in the Champlain Valley. It is bordered by Lake Champlain and the Adirondack Mountains to its west and the Green Mountains to its east, Addison County. The three largest towns in Addison County are Bristol, Middlebury, and Vergennes, but there are many desirable communities located in Addison County. Apart from terrific outdoor activities such as leaf peeping in the Fall, skiing in the Winter, and boating on the lake in the Summer, Addison County also has a thriving economic base thanks to institutions like Middlebury College and employers like Goodrich Aerospace. Browse available Addison County real estate below.