Brunswick is a town in Rensselaer County, New York, in the United States. The municipality was originally settled in the early 18th century. During its history, it had been part of Albany County, Rensselaerswyck, and Troy, before its incorporation in 1807. It is bordered on the west by the city of Troy; on the north by Schaghticoke and Pittstown; on the east by Grafton; and on the south by Poestenkill and North Greenbush. The population was 11,941 at the 2010 census. The source of the town's name is not certain, though some claim it comes from the source of its first inhabitants from the province of Brunswick-Luneburg in Germany.