Huntington Harbour is a community of about 3,500 people located in the northwestern section of Huntington Beach in Orange County, California. Huntington Harbour is a residential development of 680 acres (280 ha) which includes five man-made islands with waterways varying from 15 to 20 feet (4.6 to 6.1 m) in depth used for boating. The five man-made islands in Huntington Harbour include: Admiralty, Davenport, Gilbert, Humboldt, and Trinidad.