Barnstead is a town located in Belknap County, New Hampshire. As of the 2000 census, the town had a total population of 3,886.
According to the United States Census Bureau, the town has a total area of 113.9 km2 (44.0 mi2). 108.6 km2 (41.9 mi2) of it is land and 5.3 km2 (2.0 mi2) of it is water. The total area is 4.66% water.