Hoosick is a town in Rensselaer County, New York, United States. The population was 6,924 at the 2010 census. It was named from the Hoosic River. The Town of Hoosick is in the northeastern corner of …Hoosick is a town in Rensselaer County, New York, United States. The population was 6,924 at the 2010 census. It was named from the Hoosic River. The Town of Hoosick is in the northeastern corner of Rensselaer County.