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 (+4.4%) from the 2010 census count of 4,078, which in turn reflected an increase of 18 (+0.4%) 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.