Brattleboro, originally Brattleborough, is a town in Windham County, Vermont, United States. The most populous municipality abutting Vermont's eastern border, Brattleboro is located about 10 miles north of the Massachusetts state line, at the confluence of Vermont's West River and the Connecticut. In 2014, Brattleboro's population was estimated by the U.S. Census Bureau to be 11,765.Marlboro College Center for Graduate and Professional Studies and SIT Graduate Institute are located in the town. There are satellite campuses of three colleges as well: Community College of Vermont, Union Institute and University, and Vermont Technical College. The town is home to the New England Center for Circus Arts and the Vermont Jazz Center.The Brattleboro Retreat, a not-for-profit mental health and addictions psychiatric hospital, is also located in the town.