Hornsby Shire is a local government area situated in Northern Sydney (Upper North Shore), as well as parts of the Hills District, in the state of New South Wales, Australia. The shire stretches from the M2 Hills Motorway in the south to the Hawkesbury River town of Wisemans Ferry, some 53 kilometres (33 mi) to the north, making it the largest local government council in the Greater Sydney Metropolitan region by total area. As of the 2016 census the shire had an estimated population of 142,667.