Teaneck is a township in Bergen County, in the U.S. state of New Jersey. It is a bedroom community in the New York metropolitan area. As of the 2020 United States census, the township's population was 41,246, an increase of 1,470 (+3.7%) from the 2010 census count of 39,776, which in turn reflected an increase of 516 (+1.3%) from the 39,260 counted in the 2000 census. As of 2020, Teaneck was the s…