Teaneck is a
township in
Bergen County,
New Jersey, United States, and a
suburb in the
New York metropolitan area. As of the
2010 United States Census, the township's population was 39,776, reflecting an increase of 516 (+1.3%) from the 39,260 counted in the
2000 Census, which had in turn increased by 1,435 (+3.8%) from the 37,825 counted in the
1990 Census. As of 2010 it was the second-most populous among the 70 municipalities in Bergen County, behind
Hackensack, which had a population of 43,010.