Windham County is a county located in the northeastern corner of the U.S. state of Connecticut. As of the 2010 census, the population was 118,428, making it the least populous county in Connecticut. It forms the core of the region known as the Quiet Corner. Windham County is included in the Worcester, MA-CT Metropolitan Statistical Area, which is also included in the Boston-Worcester-Providence, MA-RI-NH-CT Combined Statistical Area.