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 from the 4,060 counted in the 2000 Census, which had in turn increased by 125 from the 3,935 counted in the 1990 Census. The borough is the home of several historical landmarks, including the Ho-Ho-Kus Inn and The Hermitage.Ho-Ho-Kus was incorporated as a borough by an act of the New Jersey Legislature on October 12, 1908, from what had originally been the borough of Orvil, which was in turn created on March 8, 1905, from portions of Orvil Township.As of the 2000 United States Census, Ho-Ho-Kus was the 15th-wealthiest community in New Jersey with a per capita money income of $163,594 as of 1999, an increase of 36.9% from the $146,451 recorded in 1989. The borough's median household income was $165,827 in 2013.