Hackensack is a
city in
Bergen County,
New Jersey, United States, and serves as its
county seat. It was officially named
New Barbadoes Township until 1921, but it was informally known as Hackensack. As of the
2010 United States Census, the city's population was 43,010, reflecting an increase of 333 (+0.8%) from the 42,677 counted in the
2000 Census, which had, in turn, increased by 5,628 (+15.2%) from the 37,049 counted in the
1990 Census.