Marlborough, CT

Marlborough is a town in Windham County, Connecticut, United States. The population was 10,827 at the 2010 census. It is the county seat of Windham County.

The town was first settled in 1764 by Ebenezer and John Brown. The area was originally part of Windsor Township but became a separate township in 1792. The town name honors John Churchill, 1st Duke of Marlborough (1660-1722), an English general and statesman who served as Prime Minister from 1690 to 1698 and again from 1710 to 1711.

Marlborough is located at . According to the United States Census Bureau, the town has a total area of , of which is land and , or 2.75%, is water.

As of the census of 2000, there were 10,521 people, 4,902 households, and 3,187 families residing in the town. The population density was 553.2 people per square mile (213.4/km²). There were 5,164 housing units at an average density of 248.6 per square mile (96.7/km²). The racial makeup of the town was 97% White, 0% African American, 0% Native American, 1% Asian