Ho-Ho-Kus (pronounced ho-HO-kus) is a borough in Bergen County, New Jersey, United States. As of the 2010 census, the borough's population was 4,078, reflecting an increase of 18 (+0.4%) from the 4,060 counted in the 2000 Census, which had in turn increased by 125 (+3.2%) from the 3,935 counted in the 1990 Census.