Ho-Ho-Kus is a borough in Bergen County, in the U.S. state of New Jersey. As of the 2020 United States census, the borough's population was 4,258, an increase of 180 from the 2010 census count of 4,078, which in turn reflected an increase of 18 from the 4,060 counted in the 2000 census. The borough is the home of several historical landmarks, including the Ho-Ho-Kus Inn and The Hermitage.